That explanation is actually pretty solid—and it lines up well with what sleep science tells us.
Here’s the idea in simpler terms:
Your body needs to cool down slightly to fall asleep. This is part of your internal clock (circadian rhythm). When your core temperature drops, your brain gets the signal: “time to sleep.”
So why the foot?
Your feet (and hands) are some of the best places for releasing heat
They have special blood vessels (arteriovenous anastomoses) that let heat escape quickly
When you stick one foot out, you create a small “heat vent” without getting fully cold
This helps create what scientists call a distal-to-proximal gradient—basically:
Core cools down
Extremities (like feet) release heat
That combo makes it easier to fall asleep faster.
