Getting cold feet may be more than just an uncomfortable inconvenience—it could be keeping you awake at night. Experts say that the temperature of your extremities plays a crucial role in how quickly you fall asleep.
“Our body temperature leads our sleep cycle,” says Kenneth Diller, a professor of biomedical engineering at the University of Texas at Austin, who has studied thermoregulation for years. “Your body does best when the central area is cooler, and the peripheral is warmer.”
Research over the past decades shows that people with warm hands and feet fall asleep faster than those whose extremities remain cold. The reason lies in the body’s natural cooling process. As the body prepares for rest, it needs to lower its core temperature. Warming the hands and feet helps accomplish this because these areas act as heat-release zones. When blood flows easily to the skin of the extremities, excess heat escapes from the core, signaling the brain that it is time to sleep. Cold hands and feet, on the other hand, trap heat and make it more difficult to drift off.
“Warming up your hands and feet leads your body very effectively into sleep,” Diller explains. “Otherwise, you just lie there feeling miserable.”
Experts recommend a variety of strategies to warm up before bedtime. Taking a hot shower or bath is one of the most effective methods. Diller, who often exercises in the evening, describes increasing the water temperature at the end of his shower to trigger blood flow to the hands and feet. He cautions against exceeding 111°F to avoid thermal injury. “I looked down at my hands, and they were red, which signaled that blood was traveling to the AVAs, specialized blood vessels that release heat. I thought to myself, ‘I may have made a remarkable discovery,’” he recalls.
Heating pads can also help. Placing one under the pillow or near the cervical spine can activate the body’s thermal regulation system, warming hands and feet within minutes. “It’s like holding a match under the thermostat,” Diller says.
For a simpler approach, experts suggest slipping on a pair of warm, fuzzy socks. No matter the method, the goal is to overcome one of the body’s biggest obstacles to sleep. Cold extremities keep the nervous system alert, while warmth signals that it is time to rest.
“As long as I’ve got cold hands and feet,” Diller adds, “I’m not going to be doing a good job of falling asleep.” With simple measures like soaking in a warm bath, using a heating pad, or putting on cozy socks, many people can give their bodies the thermal cue needed for a faster, more restful night.
