The Case for Wearing Socks to Bed

Six young adults slept in a deliberately cool room, 23°C, on two separate nights, once wearing feet-warming bed socks and once without, while researchers tracked their sleep with wrist actigraphy and monitored core and skin temperature throughout. On the socks night, participants fell asleep 7.5 minutes faster, slept 32 minutes longer in total, woke up 7.5 times less often, and showed higher sleep efficiency overall, all without any change in core body temperature or heart rate. Foot temperature stayed about 1.3°C higher throughout the night, consistent with the principle that warm extremities help trigger sleep.

This is a small, single-night crossover study of just six young men, so the numbers themselves shouldn't be taken as universal, and it says nothing about women, older adults, or longer-term use. What it demonstrates cleanly, though, is the mechanism: a simple, low-cost intervention that warms the feet without heating the whole body or the room appears to work with the body's own sleep-onset process rather than against it, particularly useful for anyone who prefers a cool bedroom but struggles with cold feet.