A study published in the Journal of Physiology found that people with warmer hands and feet—and therefore a higher DPG—fell asleep much more quickly than those with cooler extremities.
Exposing one foot can raise this gradient almost instantly, helping your body settle into sleep without removing all your bedding or lowering the thermostat.
Other ways to support natural cooling
Letting one foot breathe is a simple trick, but combining it with other temperature-friendly habits can further improve sleep quality:
Take a warm bath or shower one to two hours before bedtime to increase skin temperature and trigger a cooling effect afterward.
Keep your bedroom cool, ideally between 65 F and 68 F, as recommended by the Sleep Foundation.
If your feet are usually cold, warm them briefly with socks or a foot soak, then remove layers as needed to fine-tune comfort.
Dangling foot doesn’t work for everyone
Although many people swear by the foot-out method, it isn’t ideal for everyone. If you tend to have cold feet, poor circulation, or conditions such as Raynaud’s disease, exposing your foot may feel unpleasant rather than soothing. In those cases, gentle warming may be more helpful than cooling.
Children, older adults, and people sleeping in already cool environments may also benefit more from retaining heat rather than releasing it. The key is listening to your body—comfort matters more than following a rule.
If you find yourself restless under the covers, try slipping one foot out and see how it feels. This small, instinctive movement works with your body’s natural thermoregulation system, allowing heat to escape and quietly signaling your brain that it’s time to rest.
Sometimes, better sleep really does begin from the ground up.
