Sleep
A single sauna session in the evening has been shown to shorten time-to-sleep and increase slow-wave deep sleep by 20–30%. The mechanism is thermodynamic: the drop in core body temperature after sauna triggers sleep onset.
The temperature mechanism
The body falls asleep when core temperature drops. A sauna session raises core temp sharply, then — after you exit — the subsequent cooling mimics and amplifies the natural temperature drop that triggers sleep. A 20-minute sauna 1–2 hours before bed is the most evidence-supported sleep intervention short of medication.
Alaska's sleep challenges
Alaska's 22-hour summer days disrupt circadian rhythms for much of the year. An evening sauna ritual provides a consistent thermal cue that anchors the body's sleep cycle regardless of ambient light.
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