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It’s a drop in temperature that actually triggers sleep. Warmth does not trigger sleep per se. So why do so many people report feeling sleepy when they get warm?
This is likely due to the combination of a couple of things. Firstly, it’s hard work. When you get warm your blood pressure drops. Less oxygen gets to your brain and your body has to work a little bit harder. This can make you feel tired. Secondly, your body and brain associate warmth with safety and comfort. Since birth you’ve been associating this with sleep. As such, you’ll feel tired and safe when warm and comfortable.
It’s also very likely that people notice feeling tired in the evening, after eating dinner or in the lounge watching a bit of T.V. This happens to be a time when we keep our house nice and warm. As such people associate feeling tired when warm.
Heat, rather than warmth, can lead to you feeling sleepy. This is usually due to dehydration, changes in blood pressure, your body working hard to keep you at a constant temperature and sudden drops in temperature often due to moving from heat to air-conditioned rooms.