Andrew Huberman· PhD
because of the way that the body Thermo regulates you actually end up cooling yourself off you think no I got in the sauna actually... the the sauna is a great tool before sleep or or warm shower or hot bath or warm bath for the following reason the brain area that controls Thermo regulation is the medial preoptic area which is operates like a thermostat so if you warm the external portion of the body the brain has to then what cool down your core body temperature it doesn't happen right away but it happens as you get out of the sauna and maybe you take a a warmish shower or cool shower so what ends up happening is that you warmed up which allows you to cool down internally and then you're able to fall asleep and stay more deeply asleep