eli5: Why are cold showers good for your mental and physical health but also put you to sleep?

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eli5: Why are cold showers good for your mental and physical health but also put you to sleep?

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When you go to sleep, your body temperature drops. Having a cold shower lowers your body temperature, which naturally makes you sleepy. It’s the same reason why having a cold room at night makes it easier to sleep. The drop in body temperature signals your body that it’s time to go to sleep. Also, any routine you normally do right before bed will signal your brain that it’s time to wind down, so if you normally take a cold shower before bed, you’ll have that going for you too.