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The cold water is not incidental. It is the protocol.
The research
Built on evidence. Not wellness culture.
Every modality in the HAVN programme is grounded in peer-reviewed research. Below are the five studies most directly relevant to the protocol design, covering cold water immersion, HRV biofeedback and breathwork, the glymphatic system and sleep, vagal nerve stimulation, and circadian regulation. Hundreds of studies were reviewed. These are the ones that shaped what made it into the programme, and why.
Hundreds of studies reviewed. Every modality personally tested and measured. What made it into this programme is only what actually moves the needle, sequenced in the order that produces the strongest effect, in an environment that does half the work.. Eugene Pienaar
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01
Cold exposure
Regular cold water immersion produces a 200–300% increase in norepinephrine and trains the nervous system to recover faster from acute stress
Research published in the European Journal of Applied Physiology shows that regular cold water immersion produces a sustained increase in norepinephrine, a key neurotransmitter for alertness and mood, and trains the autonomic nervous system to recover faster from acute stress. Participants showed measurably improved stress tolerance after just 10 sessions. The magnitude of the response increases with repeated exposure, meaning the benefit compounds across the stay.
In HAVN: Cold exposure builds progressively across the stay, 2 minutes on Day 1, building toward 10 minutes by Day 7. The neurochemical benefit compounds daily.
European Journal of Applied Physiology · Cold water immersion and stress resilience
02
HRV & breathwork
HRV biofeedback training at an individual's resonance frequency measurably improves heart rate variability, reduces anxiety, and enhances emotional regulation, with effects persisting after training ends
A meta-analysis in Applied Psychophysiology and Biofeedback found that HRV biofeedback training at each person's personal resonance frequency significantly improves HRV, reduces anxiety, and enhances emotional regulation. Effects are measurable within 5–10 sessions and persist after training ends. The key is finding the individual resonance frequency, the breathing rate that produces the strongest HRV response for that specific person.
In HAVN: Each guest's personal resonance frequency is identified via Polar H10 biofeedback on Day 1. The breathwork audio guides are calibrated to that exact rate. Formal biofeedback sessions on arrival and final morning show the before/after shift.
Applied Psychophysiology and Biofeedback · Meta-analysis · HRV biofeedback and resonance frequency
03
Sleep & brain health
The brain's waste-clearance system (the glymphatic system) activates during deep sleep and clears at 60% higher rates than during wakefulness, chronic stress directly suppresses this process
Research published in Science (Xie et al., 2013) demonstrated that the glymphatic system clears metabolic waste from the brain primarily during deep sleep, with clearance rates increasing 60% compared to wakefulness. Subsequent studies have shown that chronic stress and elevated cortisol directly suppress glymphatic function. This is why the HAVN protocol targets every factor that determines deep sleep quality, circadian timing, temperature, light, supplements, and cortisol reduction.
In HAVN: Sleep is tracked every night with the Withings Sleep Mat and O₂ Ring. Most guests see measurable deep sleep improvement by night 3 as the protocol takes effect.
Science · Xie et al., 2013 · Glymphatic system and deep sleep clearance
04
Vagal nerve stimulation
Transcutaneous auricular vagus nerve stimulation produces measurable improvements in vagal tone, reduces heart rate, and decreases markers of sympathetic dominance, with cumulative effects from consistent daily use
Clinical studies on transcutaneous auricular vagus nerve stimulation (taVNS) show measurable improvements in vagal tone, reduced heart rate, and decreased markers of sympathetic nervous system activation. Research published in Brain Stimulation demonstrates that consistent daily use produces cumulative effects on autonomic balance. The auricular branch of the vagus nerve, accessible at the ear, provides direct stimulation of the parasympathetic pathway.
In HAVN: The Neurosym tVNS device is used twice daily across the full stay. The cumulative effect is measurable in the HRV comparison between Day 1 and the final morning.
Timed bright light exposure (10,000+ lux) in the morning resets the circadian pacemaker, normalises cortisol rhythms, and advances sleep onset, combined with evening blue-light restriction, effects on sleep architecture are measurable within 2–3 days
Research in the Journal of Clinical Sleep Medicine confirms that timed bright light exposure in the morning resets the circadian pacemaker, normalises cortisol rhythms, and advances sleep onset. The effect is enhanced by evening blue-light restriction, which prevents suppression of the body's sleep signal. Combined, these two interventions produce measurable changes in sleep architecture within 2–3 days, consistent with what most HAVN guests report by night 2.
In HAVN: A 14,000-lux SAD lamp is placed on the bedside table and switched on at the moment of waking. Blue-light blocking glasses are worn from 9pm onward. In July, Lapland's midnight sun provides an additional circadian anchor that accelerates the reset.
Journal of Clinical Sleep Medicine · Bright light therapy and circadian regulation
Cold water. Heat. Breathwork. Data. The sequence is deliberate. The order changes the outcome.
How the protocol is designed
The mechanism behind the reset.
The HAVN programme is not a collection of wellness modalities. It is a sequenced protocol designed around one concept: nervous system elasticity. The ability to go fully into sympathetic activation, and fully back into genuine parasympathetic recovery. Chronic stress narrows this range. The programme expands it, daily, through deliberate oscillation cycles.
The mechanism
The oscillation cycle
Each day includes two macro-oscillation cycles: peak activation (cold, breathwork, movement) followed by deep recovery (sauna, NSDR, nature, circles). The distance between peak activation and deep recovery is the measure of a healthy elastic nervous system. The programme expands this range daily.
The sequence
Why sequence matters
Cold before sauna produces the strongest parasympathetic rebound. Breathwork after sauna produces the deepest HRV coherence window. NSDR after breathwork allows consolidation. The sequence is intentional, changing the order changes the outcome.
The measurement
Why we measure everything
Without measurement, the shift is a feeling. With HRV biofeedback on Day 1 and the final morning, and every night of passive sleep data, the change is a number. This is what prevents the Vipassana fade, the tendency to dismiss the experience as soon as real life resumes.
The environment
Why Lapland
The research on forest bathing requires genuine forest. Cold water research specifies water, not a shower. The silence research requires genuine acoustic rest. Lapland in summer offers all three at scale, plus 20+ hours of daylight that accelerates the circadian protocol.
Research context
The studies above are peer-reviewed and represent the strongest available evidence for each modality. HAVN is not a clinical trial and the programme has not been independently evaluated. Individual results vary. This page provides transparency about the evidence informing the protocol, not clinical claims. Consult your GP before attending if you have cardiovascular or respiratory conditions.