Researchers trace how different sleep stages may fine-tune what we remember, trading specifics for more general knowledge.

HOUSTON — A good night’s sleep is important for both the body and brain. It’s essential to understand the four stages of sleep and how to get more restful z’s. Stage 1: Transitional sleep The sleep ...

Deep sleep earlier in life could be the key to keeping healthy cognition. The key to keeping your wits about you as you age may lie in shut-eye during midlife. A study found that people over 60 who ...

Your nightly sleep cycle plays a key role in the quality of your sleep. Here's what happens in each stage and why it matters ...

Researchers led by Masako Tamaki at the RIKEN Center for Brain Science in Japan report a link between deep sleep and ...

Sleep Cycles: One rapid eye movement (REM) stage and three non-REM stages that altogether last about 90 to 120 minutes Benefits: Physical and mental recuperation and memory consolidation Disorders: ...

Even if you're not getting any sleep — especially if you're not getting any sleep — a sleep tracker can help. Every night when you sleep, you go through four distinct sleep stages in roughly 90-minute ...

Sign up for CNN’s Sleep, But Better newsletter series. Our seven-part guide has helpful hints to achieve better sleep. When jolted awake by the blare of an alarm ...

It’s not exactly news that sleep is an important part of health. It’s also not exactly news that many of us struggle to get enough. Whether it’s because of a busy schedule, insomnia or feeling ...