"When you think about it, you likely poke a foot out, too, probably without even realizing it. It's natural to want to slide a few toes into the cool night air, especially when you can't fall asleep. It feels like an instant reset, and may help you fall asleep pretty much instantly - and there are quite a few reasons for that."
"One reason why it feels good to stick a foot out of your hot, heavy blankets, even when your head and arms are already in the fresh air, is that your feet are essentially built-in thermostats. "They have more special blood vessels [near the surface of your skin] - called arteriovenous anastomoses - that help the body dump heat efficiently," Kaylor says. "Arms don't have as many of those, so a foot does the job faster.""
Sticking a foot out from the covers fine-tunes body temperature and often speeds sleep onset. The behavior appears common across many people and is frequently shared on social media. Feet contain abundant arteriovenous anastomoses near the skin surface that dump heat more efficiently than arms. Exposing one foot provides a small cooling adjustment that balances feeling too hot or too cold. That slight skin cooling can produce an instant reset and reduce sensory discomfort. Some people do it for comfort or sensory balance. Others may use it to reduce restless leg sensations or mild overheating during sleep.
Read at Bustle
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