When the room temperature goes down to the 60's F, I keep yawning continuously.!
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body temperature is 98.6 F when you enter a cold environment your body has to work harder to keep it at that temperature otherwise it would drop to the temperature of the room.if the environment is sufficiently cold you body has to work so hard to keep it at 98F that it cannot keep you awake and warm at the same time.the effect is similar to feeling tired after eating a heavy meal
Other Answers:
I think your body is shutting down to conserve energy that it needs to create heat. It wants to put you to sleep, because sleep is a low-energy state, just in case it needs to survive in cold conditions.
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