Non-24 and your master body clock

Everyone has a master body clock. For most people, the body clock runs slightly longer than 24 hours and is reset every day by environmental light that's detected by the eye, which then signals the brain. For people who are totally blind, however, the body clock becomes out of sync with the 24-hour day-night cycle, and your body's natural rhythms can sometimes have you sleeping during the day and awake at night. Because the non-24-hour body clock creates an ever-shifting sleep-wake cycle, Non-24 is classified as a circadian rhythm disorder.

Learn more about your master body clock