Why We Sleep Better in Cooler Rooms – And Why a Hot Shower Can Help

In the world of holistic health, quality sleep is foundational to healing, regeneration, and mental clarity. Yet many people struggle with falling or staying asleep, unaware that their sleeping environment, particularly the temperature, may be working against them. Interestingly, both science and traditional wisdom agree: a cooler room helps the body sleep more deeply. But perhaps more surprising is the fact that a hot shower before bed can actually help you fall asleep faster. How can both be true?

Let’s explore the physiology of thermoregulation, circadian rhythms, and the role of temperature in sleep and what this means for your wellness routine.

Cooler Temperatures Support the Body’s Natural Sleep Rhythms

Human sleep is governed by the circadian rhythm, a 24-hour biological clock that regulates many body functions, including core body temperature. In a healthy cycle:

Core temperature begins to drop in the late evening, signaling the brain to prepare for sleep.
This drop continues through the night, reaching its lowest point around 4 a.m., then rising toward morning wakefulness.
A cooler ambient temperature supports this process, helping initiate and sustain deeper stages of sleep.

In essence, cooling the body acts as a natural signal for the nervous system to wind down. When the room is too warm, the body struggles to release heat, leading to more wakefulness, disrupted REM cycles, and less restorative sleep.

According to research, temperatures between 60–67°F (15–19°C) are optimal for most adults to achieve better sleep efficiency and fewer nighttime awakenings (Kräuchi et al., 2000).

Why a Hot Shower Before Bed Helps – Through Cooling

Here’s where it gets interesting. While cooler environments promote better sleep, a hot shower (or bath) about 1–2 hours before bed has also been shown to help people fall asleep faster. This isn’t a contradiction, it’s physiology in action.

Here’s how it works:

A hot shower raises skin temperature, prompting the blood vessels near the surface (especially in hands, feet, and face) to dilate.
This vasodilation enables the body to shed heat more effectively once you step out of the shower.
As a result, your core body temperature rapidly decreases, mimicking the natural nighttime drop and signaling your brain to initiate sleep.

This process supports the body’s thermoregulation and helps shorten sleep onset latency, the time it takes to fall asleep.

A 2019 meta-analysis found that warm showers or baths taken 1–2 hours before bedtime reduced sleep onset time by up to 10 minutes, especially when combined with a cool sleeping environment (Haghayegh et al., 2019).

Holistic Implications: Sleep as a Ritual of Restoration

From a holistic health perspective, sleep is not merely a pause in activity. It is the body’s most profound period of healing and integration. Optimizing temperature regulation supports:

Melatonin production, which rises as the core temperature drops
Activation of the parasympathetic nervous system, the body’s natural “rest-and-digest” state
Emotional regulation, immune repair, and neurocognitive processing during REM and deep sleep

In this context, a hot shower can become more than hygiene. It can become a pre-sleep ritual, one that invites the body into a state of balance. The transition from warmth (shower) to coolness (bedroom) becomes a symbolic and physiological descent into stillness.

This aligns beautifully with Eastern practices such as Taoist bath meditations and Ayurvedic evening routines (dinacharya), which emphasize gentle warming, grounding, and purification before rest.

Practical Tips for Holistic Sleep Support

If you’re struggling with sleep or just want to deepen your nightly restoration try this:

Take a warm shower (104–109°F / 40–43°C) about 90 minutes before bed.
Use the time to also slow your breathing, quiet your thoughts, and mentally disconnect from the day.
After drying off, transition to a cool, dark room (60–67°F).
Choose natural fiber bedding and avoid artificial light sources or screens.
Consider mindful breathing, gentle stretching, or herbal teas to further activate the parasympathetic nervous system.

Honor the Body’s Rhythms

The human body has an elegant wisdom built into its rhythms. By working with rather than against these cycles, we allow sleep to unfold more naturally. In holistic wellness, small shifts, like adjusting your room temperature or adding a warm shower to your evening routine can have a profound impact on your physical, emotional, and spiritual vitality.

Instead of forcing sleep through stimulants or sedatives, let the body return to its own balance. Honor the descent into stillness and let cool darkness and gentle ritual guide you into healing rest.

References:

Cagnacci, A., Elliott, J. A., & Yen, S. S. (1992). Melatonin: a major regulator of the circadian rhythm of core temperature in humans. The Journal of clinical endocrinology and metabolism, 75(2), 447–452. https://doi.org/10.1210/jcem.75.2.1639946

Haghayegh, S., Khoshnevis, S., Smolensky, M. H., Diller, K. R., & Castriotta, R. J. (2019). Before-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysis. Sleep Medicine Reviews, 46, 124–135. https://doi.org/10.1016/j.smrv.2019.04.008

Kräuchi, K., Cajochen, C., Werth, E., & Wirz-Justice, A. (2000). Functional link between distal vasodilation and sleep-onset latency? American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 278(3), R741–R748. https://doi.org/10.1152/ajpregu.2000.278.3.R741

Luu, B., MD. (2025, May 22). Unlock Better Sleep with a Warm Shower. Brandon Luu MD. https://brandonluumd.substack.com/p/unlock-better-sleep-with-a-warm-shower

Reflections on Dopamine, Addiction, and Mental Health

Through my exploration of the neuroscience of dopamine, I’ve come to appreciate its profound role in our emotional lives. Dopamine is far more than a “pleasure molecule”; it is essential for motivation, movement, and maintaining the delicate balance between pleasure and pain in the brain (Volkow & Morales, 2015). Understanding this balance has helped me see why addiction and mood disorders are so difficult to overcome.

One key insight is that our experience of pleasure or pain depends on fluctuations from a baseline level of dopamine, rather than absolute levels themselves. Chronic overstimulation, whether from substances, gambling, or social media, lowers this baseline over time, creating a dopamine-deficit state that can manifest as depression, anxiety, or compulsive behaviors (Koob & Le Moal, 2008; Grace, 2000).

The “pleasure-pain balance” in the brain acts like a seesaw: when dopamine surges from a pleasurable experience, the brain compensates by tilting toward pain to maintain homeostasis (Lembke, 2021). This explains why repeated highs can paradoxically lead to emotional lows, trapping people in cycles of craving and withdrawal.

It’s also clear to me that individual differences, including genetics, temperament, and life experiences, can play a powerful role in addiction vulnerability. For example, impulsiveness, a trait that may have been beneficial for survival in ancient environments, becomes a liability in today’s world of constant sensory stimulation, increasing the risk of addiction (Bickel et al., 2006).

Recognizing the value of a “dopamine reset,” I see the clinical wisdom in recommending about 30 days of abstinence from addictive substances or behaviors. This period allows dopamine receptor sensitivity and transmission to recover, helping restore emotional balance and reduce cravings. The first two weeks are typically the most challenging, but pushing through this phase can reset dopamine pathways and improve mood (Lembke, 2021).

Another powerful realization is that truth-telling can be a therapeutic tool. Honesty engages the prefrontal cortex, the part of the brain responsible for self-control and planning, helping to regulate the limbic system’s reward circuits and reducing the risk of relapse (Goldstein & Volkow, 2011). Even small daily acts of honesty can strengthen these neural pathways.

In addition, the emerging use of psychedelic-assisted therapy with substances like MDMA or psilocybin shows promise for treating addiction, but it is not a one-size-fits-all solution. These treatments must be approached cautiously and conducted in clinical settings with appropriate oversight to ensure safety and efficacy (Carhart-Harris & Goodwin, 2017).

Finally, I’ve come to view social media as a potent dopamine stimulator engineered to exploit the brain’s reward system in ways strikingly similar to addictive drugs. Excessive use can fragment attention, lower baseline dopamine, and erode real-life social connections. Intentional boundaries are crucial to prevent compulsive patterns and protect mental health in our increasingly digital world (Montag et al., 2019).

Key Takeaways

Dopamine is critical for motivation, movement, and pleasure; dysfunction disrupts mood and drive (Palmiter, 2008).
The brain’s pleasure-pain balance means each dopamine high is followed by a compensatory low, explaining emotional crashes after overstimulation (Lembke, 2021).
A “30-day dopamine reset” can restore healthy dopamine signaling and emotional stability (Lembke, 2021).
Truth-telling engages prefrontal circuits, strengthening self-regulation and supporting recovery (Goldstein & Volkow, 2011).
Psychedelic-assisted therapy shows promise but must be approached carefully with professional supervision (Carhart-Harris & Goodwin, 2017).
Social media exploits dopamine systems, requiring intentional boundaries to protect focus and well-being (Montag et al., 2019).

Conclusion

Reflecting on the neuroscience of dopamine has deepened my understanding of how pleasure and pain are intimately linked in the brain. Recognizing the risks of chronic overstimulation and the power of tools like dopamine resets, radical honesty, and mindful technology use provides a path forward in maintaining emotional health and resilience. These insights offer practical ways to navigate today’s dopamine-saturated world with greater awareness and balance.

References

Bickel, W. K., Miller, M. L., Yi, R., Kowal, B. P., Lindquist, D. M., & Pitcock, J. A. (2006). Behavioral and neuroeconomics of drug addiction: Competing neural systems and temporal discounting processes. Drug and Alcohol Dependence, 90, S85–S91. https://doi.org/10.1016/j.drugalcdep.2006.09.016

Carhart-Harris, R. L., & Goodwin, G. M. (2017). The therapeutic potential of psychedelic drugs: Past, present, and future. Neuropsychopharmacology, 42(11), 2105–2113. https://doi.org/10.1038/npp.2017.84

Goldstein, R. Z., & Volkow, N. D. (2011). Dysfunction of the prefrontal cortex in addiction: Neuroimaging findings and clinical implications. Nature Reviews Neuroscience, 12(11), 652–669. https://doi.org/10.1038/nrn3119

Grace, A. (2000). Gating of information flow within the limbic system and the pathophysiology of schizophrenia. Brain Research Reviews, 31(2–3), 330–341. https://doi.org/10.1016/s0165-0173(99)00049-1

Koob, G. F., & Le Moal, M. (2008). Addiction and the brain antireward system. Annual Review of Psychology, 59, 29–53. https://doi.org/10.1146/annurev.psych.59.103006.093548

Lembke, A. (2021). Dopamine nation: Finding balance in the age of indulgence. Dutton.

Montag, C., Wegmann, E., Sariyska, R., Demetrovics, Z., & Brand, M. (2019). How to overcome taxonomical problems in the study of Internet use disorders and what to do with “smartphone addiction”? Journal of Behavioral Addictions, 9(4), 908–914. https://doi.org/10.1556/2006.8.2019.59

Palmiter, R. D. (2008). Dopamine signaling in the dorsal striatum is essential for motivated behaviors: Lessons from dopamine-deficient mice. Annals of the New York Academy of Sciences, 1129(1), 35–46. https://doi.org/10.1196/annals.1417.003

Volkow, N. D., & Morales, M. (2015). The brain on drugs: From reward to addiction. Cell, 162(4), 712–725. https://doi.org/10.1016/j.cell.2015.07.046

Mind–Body Practices and Regulation of the Limbic System in Pain and Emotional Processing

Mind-body practices such as Tai Chi, Qigong, yoga, meditation, and breathwork have shown compelling effects on both pain regulation and emotional stability. These effects are largely mediated by changes in limbic system activity, particularly in the amygdala and anterior cingulate cortex (ACC), two structures centrally involved in the affective dimension of pain and mood modulation.

1. Downregulation of the Amygdala and Emotional Reactivity

The amygdala plays a critical role in emotional salience, particularly in the fear and anxiety components of pain. Mind–body interventions appear to reduce hyperactivity in the amygdala, which is often elevated in chronic pain conditions and mood disorders.

Mindfulness-based practices have been shown to reduce amygdala activation during exposure to emotional or painful stimuli (Hölzel et al., 2010).
This downregulation of emotional reactivity leads to a less catastrophizing and more neutral interpretation of pain, shifting the experience from distressing to manageable.
Long-term meditators often show reduced amygdala volume and improved emotional regulation (Taren et al., 2013).

2. Modulation of the Anterior Cingulate Cortex (ACC): Pain Unpleasantness and Attention

The ACC, which governs pain-related distress and motivational escape behaviors, is also modulated by focused mind–body training.

Regular practice of yoga or Tai Chi is associated with enhanced ACC activation during pain regulation, suggesting greater top-down control over emotional responses (Villemure et al., 2014).
The ACC is engaged during focused attention and cognitive reappraisal, key skills developed through qigong, breath regulation, and meditation.
By enhancing attentional control, practitioners can shift perception away from pain or reinterpret its meaning, reducing suffering even when nociceptive input remains constant.

3. Interoception and Limbic-Cortical Integration

Mind-body practices foster interoceptive awareness, or the ability to perceive internal bodily states, which is linked to insula, ACC, and medial prefrontal cortex activity.

Improved interoceptive accuracy allows for early recognition of emotional arousal or pain-related tension, enabling better regulation through breath or posture (Farb et al., 2013).
Tai Chi and Qigong practices emphasize sensing and refining internal energy (Qi), which can be seen as cultivating precise interoceptive sensitivity that buffers limbic reactivity.

4. Reduction in Mood Swings and Affective Dysregulation

Since pain and mood are tightly coupled in limbic circuits, emotional mood swings often accompany pain flare-ups. Mind-body practices support mood stability through:

Autonomic regulation (improved vagal tone, parasympathetic dominance),
Cognitive reappraisal (enhanced prefrontal-limbic communication),
And hormonal modulation (reduced cortisol, increased endorphins and oxytocin).

This leads to more resilient stress responses, fewer negative ruminations, and less affective volatility.

Summary Table: Effects of Mind–Body Practices on Limbic Pain Modulation

Practice	Target Area	Effect on Pain/Mood
Meditation / Mindfulness	Amygdala, ACC, mPFC	Reduced emotional reactivity, improved pain tolerance
Tai Chi / Qigong	ACC, Insula, PAG	Improved interoception, emotional regulation, reduced chronic pain
Yoga / Breathwork	ACC, Brainstem, Vagal System	Increased parasympathetic tone, mood stabilization, decreased pain unpleasantness

Regular practice of mind–body disciplines such as Tai Chi and Qigong appear to reduce emotional distress and negative affect, which are mediated by limbic structures including the amygdala and ACC (Xu, Baker, & Ren, 2021). By combining gentle movement with mental focus and breath regulation, Tai Chi engages both somatosensory and emotional‑regulatory brain circuits, potentially dampening the emotional component of pain and improving mood stability.

References:

Farb, N. A. S., Segal, Z. V., & Anderson, A. K. (2013). Attentional modulation of primary interoceptive and exteroceptive cortices. Cerebral Cortex, 23(1), 114–126. https://doi.org/10.1093/cercor/bhr385

Hölzel, B. K., et al. (2010). Stress reduction correlates with structural changes in the amygdala. Social Cognitive and Affective Neuroscience, 5(1), 11–17. https://doi.org/10.1093/scan/nsp034

Leknes, S., & Tracey, I. (2008). A common neurobiology for pain and pleasure. Nature Reviews Neuroscience, 9(4), 314–320. https://doi.org/10.1038/nrn2333.

Tang, Y., Hölzel, B. K., & Posner, M. I. (2015). The neuroscience of mindfulness meditation. Nature Reviews. Neuroscience, 16(4), 213–225. https://doi.org/10.1038/nrn3916

Taren, A. A., Creswell, J. D., & Gianaros, P. J. (2013). Dispositional mindfulness co-varies with smaller amygdala and caudate volumes in community adults. PLoS ONE, 8(5), e64574. https://doi.org/10.1371/journal.pone.0064574

Villemure, C., Čeko, M., Cotton, V. A., & Bushnell, M. C. (2014). Insular cortex mediates increased pain tolerance in yoga practitioners. Cerebral Cortex, 24(10), 2732–2740. https://doi.org/10.1093/cercor/bht124

Xu, S., Baker, J. S., & Ren, F. (2021). The Positive Role of Tai Chi in Responding to the COVID-19 Pandemic. International Journal of Environmental Research and Public Health, 18(14), 7479. https://doi.org/10.3390/ijerph18147479

Nose Breathing vs. Mouth Breathing

Among many healthcare professionals, fitness enthusiasts, martial artists, musical instrument performers, and others understand that breathing through the nose, or nasal breathing is generally considered better than breathing solely through the mouth for several reasons:

1. Improved Air Filtration

Moist nasal passages help to filter pollen, dust, pathogens, and other allergens through tiny hairs called cilia and mucus which protect the lungs from harmful particles.

2. Increased Oxygen Absorption

Nasal breathing can slow down the rate of airflow, allowing more time for oxygen exchange in the lungs. This consequently leads to better oxygen delivery to tissues.

3. Better Air Humidification and Temperature Regulation

The nasal passages warm and humidify incoming air, helping to reduce irritation to the respiratory tract and improving overall comfort, particularly in dry or cold climates.

4. Nitric Oxide Production

Nasal breathing aids in the production of nitric oxide (NO), which improves blood circulation by dilating blood vessels, enhances oxygen absorption and boosts immune function by killing harmful bacteria and viruses.

5. Supports Proper Diaphragmatic Breathing

Nasal breathing encourages deeper, more controlled breathing, activating the respiratory diaphragm and reducing shallow, chest-dominated breaths often associated with stress.

6. Better Sleep Quality

Nasal breathing reduces snoring and thus reduces the risk of sleep apnea, promoting more restful and restorative sleep.

7. Improved Oral Health

Keeping the mouth closed during breathing is thought to prevent dry mouth, reducing the risk of cavities, gum disease, and bad breath.

8. Enhancement of Athletic Performance

Nasal breathing increases endurance and efficient energy use, by improving oxygen uptake and reducing the buildup of carbon dioxide within the bloodstream.

9. Balanced CO₂ and Oxygen Levels

Breathing through the nose helps maintain an optimal balance of carbon dioxide and oxygen in the blood, supporting cellular metabolism and calming the nervous system.

10. Supports Facial Development (in Children)

In children, nasal breathing promotes proper tongue posture and jaw development, reducing the risk of orthodontic issues and improving facial structure.

11. Promotes Postural Alignment

Nasal breathing supports proper tongue posture, which can improve overall posture and reduce strain on the neck and back.

12. Reduced Stress and Anxiety

Nasal breathing activates the parasympathetic nervous system, which helps reduce heart rate and stress levels, promoting a calm and focused state of mind.

13. Boosts Cognitive Function

Consistent oxygen distribution to the brain enhances focus, memory, and decision-making capabilities.

14. Voice Quality and Speech Clarity

Maintaining nasal breathing increases vocal cord health and improves voice resonance and clarity.

There may be situations where breathing through the mouth is necessary or preferable, such as during intense physical exertion or when experiencing nasal congestion. However, nasal breathing is considered the more natural and physiologically advantageous way to breathe. If someone experiences chronic nasal congestion or other issues that impede nasal breathing, it’s advisable to consult with a healthcare professional.

I teach and offer lectures about holistic health, physical fitness, stress management, human behavior, meditation, phytotherapy (herbs), music for healing, self-massage (acupressure), Daoyin (yoga), qigong, tai chi, and baguazhang.

Please contact me if you, your business, organization, or group might be interested in hosting me to speak on a wide range of topics related to better health, fitness, and well-being.

I look forward to further sharing my message by partnering with hospitals, wellness centers, VA centers, schools on all levels, businesses, and individuals who see the value in building a stronger nation through a healthier population.

I also have hundreds of FREE education video classes, lectures, and seminars available on my YouTube channel at:

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https://mindandbodyexercises.wordpress.com/

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Jim Moltzan

The Physiological Sigh and Daoist Breath Theory

Breathing is both an automatic physiological process and a foundational medium through which emotional regulation and somatic stability are maintained. Among the many respiratory patterns observed in humans, the physiological sigh represents a unique convergence of pulmonary mechanics, autonomic nervous system regulation, and traditional breath observations preserved in Daoist practices. Characterized by two sequential inhalations followed by a prolonged exhalation, the physiological sigh is an innate reflex that occurs spontaneously in healthy individuals and plays a critical role in maintaining lung function and nervous system balance (Del Negro et al., 2018; West, 2012).

While modern neuroscience and respiratory physiology have clarified the mechanisms underlying this breath pattern, Daoist and Traditional Chinese Medicine frameworks identified the functional importance of sighing centuries earlier, particularly in relation to Lung Qi regulation and emotional release. Examining the physiological sigh through both lenses reveals a rare alignment between classical somatic wisdom and contemporary scientific explanation.

Pulmonary Function and Alveolar Recruitment

From a biomedical perspective, the primary function of the physiological sigh is alveolar recruitment. During normal respiration, particularly under conditions of stress, fatigue, or restricted posture, small numbers of alveoli may partially collapse, reducing surface area available for gas exchange (West, 2012). Over time, this can lead to reduced lung compliance and diminished respiratory efficiency.

The physiological sigh counteracts this process through a brief second inhalation that increases transpulmonary pressure, allowing collapsed alveoli to reopen. This mechanism preserves lung elasticity and optimizes oxygen exchange, making the sigh an essential component of healthy respiratory maintenance rather than an incidental behavior (Del Negro et al., 2018).

Autonomic Nervous System Regulation

Beyond its mechanical function, the physiological sigh exerts a powerful influence on the autonomic nervous system. The prolonged exhalation phase enhances parasympathetic activity, primarily through vagal pathways, resulting in decreased heart rate, reduced sympathetic arousal, and rapid attenuation of stress responses (Porges, 2011).

Research in applied psychophysiology demonstrates that breathing patterns emphasizing extended exhalation improve heart rate variability and stabilize respiratory rhythm, contributing to reductions in perceived anxiety and respiratory discomfort (Lehrer et al., 2000). Because the sigh operates at the level of brainstem control rather than conscious effort, it remains effective even during states of emotional overwhelm or impaired cognitive processing.

Neurophysiological Basis of the Sigh Reflex

The physiological sigh is generated by respiratory rhythm centers located in the medulla, particularly the pre-Bötzinger complex and associated neural networks (Ramirez et al., 2013). These circuits integrate chemosensory feedback related to carbon dioxide levels and lung stretch, allowing the sigh to emerge automatically when respiratory efficiency declines.

This brainstem dominance explains why sighing is commonly observed during crying, emotional release, and moments of relief, as well as during sleep. It also explains why voluntary imitation of the physiological sigh can produce rapid calming effects when higher cognitive strategies are ineffective.

Daoist and Traditional Chinese Medicine Perspective

In Daoist breath theory and Traditional Chinese Medicine, sighing is closely associated with the Lung system, which governs respiration, rhythm, and the distribution of Qi (vital energy) throughout the body. The Lung is also linked to the Po, or corporeal soul, which is sensitive to grief, shock, and emotional contraction. Classical medical texts describe sighing as a spontaneous mechanism through which constrained Lung Qi is released and chest tension is alleviated.

The double inhalation observed in the physiological sigh can be interpreted within this framework as a restoration of Zong Qi, the gathering Qi of the chest, while the extended exhalation facilitates the descent and regulation of Lung Qi. This process supports Lung and Kidney coordination, a foundational principle in Daoist internal cultivation and breath regulation practices.

Dao Yin and qigong systems frequently incorporate a subtle secondary inhalation at the top of the breath, followed by a slow and complete exhalation. While historically described in energetic terms, modern physiology reveals that these practices align closely with alveolar recruitment and parasympathetic activation, suggesting that Daoist practitioners were observing functional outcomes long before their mechanisms could be scientifically articulated.

Integrative Application and Intentional Use

The physiological sigh can be intentionally reproduced as a practical tool for acute regulation:

A gentle nasal inhalation
A short secondary inhalation at the top of the breath
A slow, extended exhalation until comfortably empty

This sequence may be repeated one to three times and is best used as a reset rather than a continuous breathing pattern. Excessive repetition may lead to lightheadedness due to altered carbon dioxide levels.

From an integrative perspective, this method represents neither a purely mechanical intervention nor a symbolic ritual. Rather, it is a functional reset that simultaneously restores lung mechanics, autonomic balance, and somatic coherence.

The physiological sigh exemplifies a rare point of convergence between modern respiratory science and Daoist breath theory. Scientifically, it functions as an essential mechanism for maintaining lung compliance and autonomic regulation through innate brainstem circuits. Traditionally, it has been recognized as a natural means of releasing chest constraint, settling the Heart Mind, and restoring respiratory rhythm.

This convergence underscores an important principle in integrative health: some of the most effective regulatory mechanisms are not learned techniques, but inherent biological safeguards that can be consciously supported when needed. The physiological sigh stands as a compelling example of how ancient somatic observation and contemporary neuroscience can inform and enrich one another.

References:

Balban, M. Y., Neri, E., Kogon, M. M., Weed, L., Nouriani, B., Jo, B., Holl, G., Zeitzer, J. M., Spiegel, D., & Huberman, A. D. (2023). Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine, 4(1), 100895. https://doi.org/10.1016/j.xcrm.2022.100895

Del Negro, C. A., Funk, G. D., & Feldman, J. L. (2018). Breathing matters. Nature Reviews Neuroscience, 19(6), 351–367. https://doi.org/10.1038/s41583-018-0003-6

Lehrer, P. M., Vaschillo, E., & Vaschillo, B. (2000). Resonant frequency biofeedback training to increase cardiac variability. Applied Psychophysiology and Biofeedback, 25(3), 177–191. https://doi.org/10.1023/A:1009554825745

Porges, S. W. (2011). The polyvagal theory: Neurophysiological foundations of emotions, attachment, communication, and self-regulation. W. W. Norton & Company.

Li, P., Janczewski, W. A., Yackle, K., Kam, K., Pagliardini, S., Krasnow, M. A., & Feldman, J. L. (2016). The peptidergic control circuit for sighing. Nature, 530(7590), 293–297. https://doi.org/10.1038/nature16964

West, J. B. (2012). Respiratory physiology: The essentials (9th ed.). Lippincott Williams & Wilkins.