Deliberate cold exposure timing should consider baseline body temperature circadian rhythm to optimize states or avoid interfering with sleep.

“But I could imagine that because of the increases in core body temperature caused by deliberate cold exposure, that were one to do that too late in the day, evening or night that it could indeed disrupt your sleep.”

“cold exposure late in the evening will start to increase your body temperature again. And that can make it hard for some people to fall asleep.”

“However, if you have trouble sleeping, I would recommend doing the cold exposure early in the day to match that natural heating, that natural increase in body temperature that occurs across the 24-hour so-called circadian rhythm.”

“I could imagine that doing deliberate cold exposure at different times um just by way of convenience or by way of intention could be very beneficial because my body temp is going to be quite a bit warmer at one time of day versus another and in that way keeping the system tuned”

“I would hypothesize that it also might lead to some of the um subjectively reported improvements in sleep because in order to fall asleep you need your core body temperature to drop by about 1 to 3° yes”