yes - What happens is that most people fall asleep during the steepest drop toward circadian temperature minimum. Our core temp drops toward sleep onset, and wi

yes - What happens is that most people fall asleep during the steepest drop toward circadian temperature minimum. Our core temp drops toward sleep onset, and with it cortisol, and melatonin spikes as well. Warming your skin helps promote bloodflow and expels heat, thereby lowering your core temperature (more efficiently if ambient air is cool enough). We tend to lose most heat in our extremities, like the head, hands and feet. This is why pre-warming feet can reduce onset latency. If you've shifted your circadian rhythm, your core temperature falls later. What may happen then is you'll get hotter in bed as you're expelling more heat in it, and if the material is not particularly breathable it won't be as easy for you to cool down. Anyway, avoiding a shift and keeping a robust circadian rhythm really helps with onset and overall sleep quality. To this end, a consistent waking time, limited total time in bed, and sufficient exposure to sunlight after waking helps.