What is the root cause of heat stroke?
increased blood pressure
lack of hydration
lack of perspiration
increased body temperature

Lack of hydration is your answer

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Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle