You’ll ignite your metabolism

Staying cool throughout the night may help rev your metabolism, according to a 2014 study in the journal Diabetes. Researchers found that when people slept in a chilly room, they produced double the volume of brown fat—a healthy fat stored in your neck that burns calories to generate body heat—compared to when they slept in a warmer room. Keeping your body temperature lower by sleeping nude could produce the same effect, says study author Francesco S. Celi, M.D.