Everyone has their own bedtime routines, whether it’s hugging a favorite pillow, sleeping in total darkness, or adjusting the blankets just right.

But there’s one habit that many people share without even thinking about it — sticking a foot out from under the sheets.

While it might seem like a quirky preference, science reveals that this simple action actually plays a key role in helping the body fall asleep and stay asleep.

According to María José Martínez, coordinator of the Chronobiology group at the Spanish Sleep Society, our bodies naturally cool down before sleep through a process called vasodilation. This happens when blood vessels in the hands and feet expand, allowing heat to escape. By extending a foot outside the covers, you help your body lower its internal temperature, which signals the brain that it’s time to rest. Babies display a similar behavior naturally — their warm ears and noses often indicate that their bodies are releasing heat to prepare for sleep.

Creating the right sleeping environment can make this process even more effective. Experts recommend sticking to a consistent sleep schedule, aiming for seven to eight hours of rest each night, and keeping the bedroom cool, dark, and quiet. Avoiding heavy meals before bed, limiting long daytime naps, and exercising earlier in the day can also support better sleep.

What might seem like a small habit—letting one foot peek out from the sheets—is actually a clever way your body manages temperature. When paired with healthy bedtime routines, it can improve sleep quality, boost energy levels, and promote overall well-being. Sometimes, the simplest actions can have the biggest impact on how well we rest.