Yes, your body temperature is raised as you soak in your hot tub and when you leave the hot tub, your core temperature cools, which signals to your body that it is time to sleep. When you are sleeping your body temperature is at the lowest level of the day. Using your hot tub 60 to 90 minutes before you go to bed will cause this variation in body temperature to happen signaling your body that it is time to sleep.
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