A little-known and poorly understood sleep disorder that occurs during the rapid eye movement, or REM, stage of sleep has ...

In the stillness of the night, when the body should lie calm in sleep, something else may be happening beneath the surface. For some people, the dreaming mind turns the body into a stage for sudden ...

Even a single night of sleep trouble can feel distressing and lonely. You toss and turn, stare at the ceiling, and wonder how you’ll cope tomorrow. No wonder many people start to worry they’ve ...

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 ...

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 ...

It can be hard to get a diagnosis of idiopathic hypersomnia (IH). It’s easy to confuse it with other sleep disorders, such as narcolepsy. But even with a proper diagnosis, there are challenges. People ...

Idiopathic hypersomnia (IH) is a rare sleep disorder that causes extreme tiredness during the day for no clear reason. The word “idiopathic” means there’s no known cause, and “hypersomnia” means ...