How our body cools down at night
Our lungs and heart are both muscles that have a circadian variation – we have a relatively higher heart rate and heavier breathing during the day, and both slow down at night. The higher heart rate and breathing help distribute oxygen and nutrients throughout the body, including to our muscles during the day, priming us for physical activity. At night our muscles don’t need the same levels of nutrients and oxygen as they do during the day, when we are more likely to use them. This may be one reason why heart rate and breathing slow down at night, which helps the body cool down, so we can sleep better.

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