Why the World Is Finally Going to Sleep: Hot Springs, Circadian Flow, and the New Science of Sleep

What Sleep Actually Is, and Why a Resort Environment Can Reset It

To understand why an intentional stay at a mineral hot springs resort can offer benefits that a weekend at home often cannot, it helps to understand what sleep actually is at the physiological level. Sleep is one of the most metabolically active and complex states the body enters, and its functions reach into every system that governs health and longevity.

During the slow-wave stages that dominate the early part of the night, the body prioritizes physical repair, releasing growth hormone, rebuilding tissues, running immune surveillance, and processing the hormonal and metabolic byproducts of the day. During the REM-dominant stages that occur in the latter part of the night, emotional processing, memory consolidation, and the hormonal regulation of stress resilience occur. When sleep is shortened or fragmented, both sets of functions are compromised, and the consequences accumulate across immune function, cardiovascular health, metabolic flexibility, cognitive performance, and mood regulation in ways that directly relate to the longevity outcomes documented by Prof. McHill’s research.

Cortisol is one of the most informative markers here. The body builds cortisol in the early morning hours as part of a healthy circadian awakening response. Still, when sleep is insufficient or poorly timed, cortisol rises earlier and higher than it should. The curve that ideally drops during the afternoon and evening stays elevated instead. This disrupts digestion, reduces progesterone availability, impairs insulin sensitivity, and leads to the wired exhaustion that many people accept as their normal. This effect is a biological consequence of disrupted rhythm, and rhythm, unlike many things in medicine, can be reset.

What I have observed over years of clinical practice, in my work at Murrieta Hot Springs and at the Springs Resort in Pagosa Springs, is that the environment itself is the intervention. A mindful resort stay can create a meaningful change that is felt even at home. When someone removes themselves from a disruptive environment that suppresses melatonin, disconnects from the devices that keep the nervous system activated into the evening, pauses dietary patterns that destabilize blood sugar overnight, and removes the psychological context that makes it difficult for the body to release into rest, replacing it with natural circadian cues, thermal therapy, mineral-rich water, seasonal nutrition, movement, and restorative architecture, the body’s own regulatory intelligence reasserts itself with a speed that consistently surprises people.

Why Hot Springs Work

Why Hot Springs Work
Hydrothermal cycling is the key factor that makes a hot springs environment uniquely therapeutic. This is the practice of alternating hot mineral water immersion, cooler water, and periods of rest, sometimes called contrast bathing, and has been the foundation of medicinal spa traditions across Europe, the Near East, and East Asia for centuries.

Warm water immersion dilates blood vessels, improves peripheral circulation, relaxes muscular tension, soothes the autonomic nervous system, and reduces the systemic inflammation that makes it harder for the body to enter and sustain deep sleep. For many guests, particularly those facing chronic stress and irregular schedules, even a single session of hydrothermal cycling produces a shift in how their bodies feel by evening. Over several days, the cumulative impact influences the nervous system’s baseline, leading guests to notice a change in their sense of self.

The thermal mechanism for sleep improvement is worth being precise about. Core body temperature follows a circadian curve, dropping in the hours before and during sleep as part of the signal that guides the body into its rest phase. Warm water immersion in the evening accelerates this process by drawing blood to the periphery and allowing heat to dissipate rapidly after the soak ends, thereby deepening the body’s sleep-onset signal and improving both the speed at which sleep arrives and the pattern that follows.

The mineral content of natural hot spring water adds another dimension. Magnesium, found in significant concentrations in many thermal mineral waters and absorbed transdermally during soaking, is one of the most important cofactors in sleep regulation and stress hormone metabolism, serving as an essential element in the production of both GABA, the brain’s primary inhibitory neurotransmitter, and melatonin, the hormone that anchors the circadian clock. Magnesium deficiency is felt widely and directly impairs both the neurochemistry of rest and the body’s resilience under stress. Soaking in mineral-rich water contributes to a pool of inputs that collectively support the physiological conditions for deep sleep.

Nature, Movement, and the Foundations of Circadian Rhythm

A hot springs stay is about understanding why its benefits persist after guests return home, which requires understanding the full picture of what the environment provides. Natural light cycles, including the soft quality of light at dusk and dawn that differs from anything produced indoors, help reset circadian cues at the level of the suprachiasmatic nucleus, the brain’s master clock. This system uses morning light to synchronize downstream physiological processes, including melatonin release, which occurs 14 to 16 hours later. The simple practice of stepping outside in the morning and allowing natural light to reach the eyes—something that happens almost automatically in a resort environment and far less often by default during a typical urban day—is among the most evidence-backed and underused circadian interventions available.

Movement at the appropriate times of day, whether that is a gentle hike in the morning, yoga, guided mobility, or a walk along the water, reinforces daily metabolic rhythm, supports hormonal regulation, and helps clear the cortisol of the awakening response in a way that frees the parasympathetic system to do its work through the rest of the day. Breathwork and light activity support circulation, lymphatic drainage, and autonomic balance in ways that compound over a multi-day stay, creating a systemic shift that reaches into the sleep architecture itself and creates habits that guests carry home.

Nutrition and the Biochemistry of Recovery

Sleep reset depends significantly on what happens long before a person lies down, because the hormonal and metabolic conditions that govern sleep are shaped by the entire day rather than only by the hour before bed. The cuisine at Murrieta Hot Springs and The Springs Resort is built around seasonal, nutrient-dense foods that stabilize blood sugar, support digestive function, and reduce systemic inflammation, all of which impact sleep hormone production, cortisol regulation, and the metabolic flexibility that allows the body to shift cleanly into its repair cycle overnight. Finishing the last meal at least 3 hours before bed reduces blood sugar fluctuations and digestive activity that disrupt sleep continuity late at night. A small protein snack in the early evening, if energy and blood sugar tend to drop, can stabilize the overnight metabolic environment without creating a digestive burden at bedtime.

A hot springs stay is not only about the water, and understanding why its benefits persist after guests return home requires understanding the full picture of what the environment provides. Natural light cycles, the soft quality of light at dusk and dawn that differs from anything an indoor environment produces, reset circadian cues at the level of the suprachiasmatic nucleus, the brain’s master clock, which uses morning light to synchronize every downstream physiological process including the melatonin release that will occur fourteen to sixteen hours later. The simple practice of stepping outside in the morning and allowing natural light to reach the eyes, something that happens almost automatically in a resort environment and almost never by default in a normal urban day, is among the most evidence-backed and underused circadian interventions available.

Movement at the appropriate times of day, whether that is a gentle hike in the morning, yoga, guided mobility, or a walk along the water, reinforces daily metabolic rhythm, supports hormonal regulation, and helps clear the cortisol of the awakening response in a way that frees the parasympathetic system to do its work through the rest of the day. Breathwork and light activity support circulation, lymphatic drainage, and autonomic balance in ways that compound over a multi-day stay, creating a systemic shift that reaches into the sleep architecture itself, not just for one night but for the duration of the stay and into the habits that guests carry home.

The SLEEP WELL Framework

Eight simple practices that create the conditions for restorative sleep.

At Murrieta Hot Springs, we developed the SLEEP WELL program to provide guests with a reliable framework of practices that, taken together, create the conditions for restorative sleep. Every guest receives a nightly wind-down ritual, along with general guidance on punctuating the day with restorative practices that enhance and extend the springs’ effects. The framework is organized around eight principles that address the full biological and environmental picture of sleep rather than treating it as a single-variable problem.

S, Same Time: Holding to a regular bedtime and wake time is one of the most powerful circadian regulators available, because the body’s hormonal, digestive, and neurological processes are all organized around a consistent schedule and dissipates when that schedule is allowed to vary, as it often does across weekdays and weekends in ways that produce a form of chronic circadian misalignment even in people who consider themselves good sleepers.

L, Light or Lack Thereof: Creating a dark and quiet sleep environment, free of electronic devices and ambient light sources, protects melatonin production at precisely the time it is most needed and removes the circadian signals that tell the brain to remain alert, because the suprachiasmatic nucleus interprets even low-level light exposure during the sleep period as a cue to suppress the hormonal chemistry of rest.

E, Eating Time: Finishing the last meal at least three hours before bed minimizes the blood sugar fluctuations and digestive activity that fragment sleep in the night’s latter hours, when the body is designed to be running its deepest repair cycles rather than processing a late dinner.

E, Electronic-Free: Avoiding screens for at least thirty minutes to two hours before bed limits exposure to the blue-spectrum light that suppresses melatonin production and delays circadian sleep onset, and it creates the transition space in which the nervous system can genuinely begin its descent from the day’s activation toward the coherent stillness that restorative sleep requires.

P, Prepare with Sunlight: Exposing yourself to 15 to 20 minutes of morning sunlight helps establish your natural sleep-wake cycle. It provides the suprachiasmatic nucleus with the environmental signal it needs to regulate subsequent hormonal and physiological processes throughout the day, including the release of melatonin, which signals sleep onset at night.

W, Water Bath: Taking an evening hot springs soak or warm bath as part of your wind-down routine can enhance both how quickly you fall asleep and your overall sleep quality. This works through the thermoregulatory mechanism discussed earlier and is among the most well-supported and practical tools for those who find it difficult to fall or stay asleep.

E, Environment: Maintaining the bedroom temperature at around sixty-seven degrees Fahrenheit helps lower the core body temperature, which is essential for deep sleep. It also eases the thermal stress on the hypothalamus, preventing the interruption or shortening of slow-wave sleep stages.

L, Limit Caffeine: Caffeine has a half-life of approximately five to six hours in most people, which means that an afternoon coffee consumed at three in the afternoon still has half its stimulating effect present in the system at eight or nine in the evening, and limiting intake in the hours before bed allows the adenosine accumulation that drives the feeling of sleepiness to build unimpeded toward its natural expression at the appropriate time.

L, Libations or Lack Thereof: Alcohol, though it often accelerates sleep onset through its sedative properties, fragments sleep architecture in the second half of the night by suppressing REM sleep and increasing the likelihood of early awakening, which means that its overall effect on sleep quality is reliably negative even when it feels initially helpful.

What a Stay Can Change That a Weekend at Home Often Cannot

The most valuable aspect of sleep tourism, in my clinical view, is that it reminds the body what it’s capable of. When someone deliberately seeks a few nights of truly restful sleep in a conducive environment, they experience wholeness. This is more than an abstract goal or a sleep score from a wearable device – it’s a real, embodied memory of waking up feeling restored. That memory becomes the reference point from which people make foundational changes, including the small micro-adjustments to daily habits that are simple enough to sustain enough to hold the gains.

In my years of clinical work and in the guest experiences I have observed across both resorts, I have rarely seen a more reliable combination for sleep reset than the one that a mineral hot springs stay provides: hydrothermal therapy that resets the autonomic nervous system, natural circadian cues that recalibrate the internal clock, mineral-rich water that supports the neurochemistry of rest, seasonal nutrition that stabilizes the metabolic environment of sleep, movement that reinforces daily rhythm, and a physical environment that conveys safety to a nervous system unfamiliar with the sensation of calmness. All the research backs up each aspect of this, and the experience itself demonstrates it clearly.

Prof. McHill is right that a good night’s sleep will improve how you feel and how long you live. What I would add, from the perspective of a physician who has spent years working at the intersection of hydrothermal medicine and integrative care, is that the path back to that sleep isn’t complicated; it simply requires the right conditions, and those conditions are exactly what we have built.