But this familiar sleep habit isn’t just about comfort. Science suggests it may be one of the easiest and most effective ways to help your body drift into sleep more quickly and naturally.
So why does the “dangling foot” trick work so well? The answer lies in how your body regulates temperature before sleep—and how your feet play a surprisingly important role in that process.
Heat, feet and sleep
As night approaches, your body begins preparing for rest by gradually lowering its core temperature. This cooling process is a key part of your circadian rhythm and is essential for falling into deep, restorative sleep.
“The drop in temperature starts about two hours before you go to sleep, coinciding with the release of the sleep hormone melatonin,” writes the Sleep Foundation. “During sleep, body temperature continues to fall, reaching a low point in the early morning and then gradually warming up as the morning progresses.”
To support this shift, your body redirects warm blood away from the core and toward the surface—especially the hands and feet. When these areas are exposed to cooler air, they act like natural vents, releasing excess heat and helping your system switch into sleep mode more efficiently.
Perfect heat-release tools
Feet and hands are uniquely suited for temperature regulation because they contain specialized blood vessels known as arteriovenous anastomoses. These vessels allow warm blood to bypass capillaries and move directly to the skin’s surface, making heat loss faster and more effective.
Letting just one foot slip out from under the blanket creates a simple, adjustable cooling mechanism. It’s comparable to opening a window slightly in a warm room—minimal effort, noticeable effect.
“I think it’s likely in service of trying to cool our bodies down because we’ve gotten too warm to sleep,” Natalie Dautovitch, a sleep health researcher and professor at Virginia Commonwealth University, told New York Magazine. “Sticking your toe out or your foot out could bring you to a more restorative sleep.”
Fall asleep faster
Sleep researchers often look at something called the distal-to-proximal gradient (DPG), which compares the temperature of your extremities—like hands and feet—to your core body temperature. A higher DPG means more heat is being released from the body, and this is strongly associated with falling asleep faster.