The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
healthy people Faso dieted very quickly in response to that warm water meaning that their hands and their feet sort of you know had this red or at least for my feet they would be this red tone to them however in the insomnia patients they did not Vaso dilate anywhere near as well so once again it suggests that when you have problems with Sleep part of the equation may be that you have imper Thermo regulatory ability
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there was also a great study unrelated from Australia they looked at insomnia patients and they put their hands or their feet in warm water
And what we have data on from some interesting research in a totally different realm is that people with extremity circulation disorders, like who have really cold hands or something like that, right? Yeah. They will have more early what we call early insomnia which is difficulty falling asleep at the beginning of the night.
10 minutes of bright outdoor light within the first hour of waking anchors the circadian phase and improves sleep onset that night.
Morning sunlight exposure shifts the cortisol awakening response forward, improving daytime alertness.
Long-term morning sunlight reduces age-related macular degeneration risk.
Sleep regularity predicts all-cause mortality more strongly than sleep duration.
Tracking deep sleep on a wearable accurately reflects EEG-measured slow-wave sleep.
Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.