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

The best Fitbit depends on your intended use case, budget, and need for advanced features in an activity tracker.

Spending lower proportions of time in two deep sleep stages — including REM sleep — may be linked to volume changes in ...

Not spending enough time in the two deep stages of sleep may hasten the deterioration of parts of the brain associated with ...

Researchers from the Yale School of Medicine found that individuals who spend less time in slow-wave and rapid eye movement (REM) sleep had smaller volumes in brain regions linked to Alzheimer's. This ...

Why is sleep so important for learning and memory? Neuroscientists from the Csicsvari group at the Institute of Science and Technology Austria (ISTA) provided new insight into this essential function ...

We’ve all signed our lives away to various social media giants and dive bars that have WiFi anyway, so we might as well get ...

The PSG profiles for insomnia attributes compared with MDD highlight the need to treat insomnia as a separate condition from MDD, not solely as a symptom. People with major depressive disorder ...

Here's what to know about each program — and how to get them for free or at a discounted rate. Thanks to biometric identification (via fingerprint or iris scans), Clear users typically do not have to ...

Au contraire, sleepy Pierre. You can get a solid eight hours and still be woefully lacking in “deep sleep” (the most ...

Au contraire, sleepy Pierre. You can get a solid eight hours and still be woefully lacking in “deep sleep” (the most important restorative rest) and REM sleep (most important for memory.) ...