Non-24-hour sleep-wake disorder (N24SWD) occurs when your sleep-wake cycle gradually shifts out of sync with the 24-hour day. It affects about half of blind people, but it can also affect those with ...

Medically reviewed by Daniel Combs, MD Key Takeaways More than 50 million Americans have a sleep disorder. Insomnia is the ...

Advanced sleep phase disorder is a rare condition that causes your natural circadian rhythm, or sleep-wake cycle, to occur earlier than typical. As humans, our sleep-wake cycle— also known as our ...

A person’s symptoms may vary depending on the sleep disorder affecting them. People may have difficulty falling asleep or experience low quality, disrupted sleep. The amount of sleep someone needs ...

Whether you’re wide awake in the middle of the night or hitting snooze one too many times in the morning, you may be grappling with a circadian rhythm sleep disorder. While there are several types of ...

Shift work disorder is a sleep disorder that specifically affects people working either night shifts or rotating shifts outside of a more common nine-to-five-type schedule. Working (or doing other ...

Chronic sleep deprivation acts as a systemic stressor, elevating risks for cardiovascular disease and metabolic dysregulation while impairing cognitive function.

YOU HAVE TO SLEEP AT THE RIGHT TIME. MINDY: IT IS VERY HARDWIRED. WE FOUND OUT THAT EVERYTHING SLEEPS AND EVERYTHING HAS A CIRCADIAN RHYTHM TOO. IT’S AN INTERNAL CLOCK. OUR BODIES ARE HARD-WIRED BY ...

Is your internal clock keeping you awake at night? Delayed sleep phase syndrome may be to blame, and it's more common than you think. Arielle Burton is an associate content manager on CNET's ...