REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

It's no secret that a good night's sleep is key to a healthy brain. However, the full extent of the importance of rest on our ...

On an Apple Watch, "core sleep" is another name for light sleep, which scientists also call stages N1-N2. It is not a type of ...

Scientists have long noted eerie parallels between psychedelic trips and rapid eye movement (REM) sleep, the stage during which you dream. Some even suggest psychedelics could induce a “waking ...

After throwing a punch out of sleep, a man reluctantly goes to his healthcare provider to get further evaluation. If you or a loved one have ever acted out dreams while remaining asleep, it could be a ...

Obstructive sleep apnea (OSA)—when the soft tissues in the throat collapse and block the airway—especially correlates to ...

Get a deeper understanding of the health metrics your smartwatch measures for you, so you can make full use of them.

For example, hippocampal theta, gamma and sharp wave oscillations are critical for memory formation and communication between hippocampal subareas and the cortex. In this study, we investigated the ...

This reorganization, observed during non-REM sleep, involved a dynamic change in the neurons representing reward locations ... This is also true for animals, as remembering for example the location of ...

People on TikTok and other social media say they feel more alert when they have had fewer hours of sleep—but sleep scientists ...