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 ...

Delayed sleep phase syndrome (DSPS) is a most prevalent circadian rhythm sleep disorder and is marked by a delay in the timing of sleep episode compared to desired or necessary sleeping and wakeup ...

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 ...

Melatonin is a hormone that regulates your sleep-wake cycle. Some research shows melatonin supplements might promote modest ...

Source: Adrienne Andersen / Pexels / Used with permission Co-authored by John Richmond Sy, Jessee Dietch, and Kathleen Bogart The power of patient communities in advocating for their needs and ...

Past age 50, men are much more likely to have REM sleep behavior disorder than women. Jose Luis Pelaez/Stone via Getty Images Every night, you go through four to five sleep cycles. Each cycle, lasting ...

As we sleep, our brain moves through four stages and two phases: non-rapid eye movement (NREM) and rapid eye movement (REM). The brain has four stages within the NREM phase. Each stage and phase of ...

Night after night, many people find themselves jolting awake at a strangely precise time, staring at the clock and wondering ...

Melatonin is a hormone secreted by the pineal gland in response to darkness. The pineal gland, which is situated in the midline of the brain, analyses the current state of the environmental light-dark ...