Your brain cycles through several stages during sleep, and REM sleep might be the most critical. This mysterious phase, where ...

"[REM sleep] is when the brain activities pick up, you have vivid dreams and the body experiences temporary paralysis of the muscles," Smith adds. "It's vital for restoring the mind and helping the ...

REM (rapid eye movement) sleep is a stage of semi-deep sleep, often referred to as “paradoxical sleep,” and is "a state of sleep when brain activity shows similar patterns as being awake," says Wendy ...

During REM sleep, your heart rate increases, your blood pressure elevates, and your eyes move. REM sleep may also be the time when your brain processes emotions and solidifies memories. Your body ...

Sign up for CNN’s Sleep, But Better newsletter series. Our seven-part guide has helpful hints to achieve better sleep. Need another reason to prioritize your sleep ...

Scientists have recently shown that both the quality and the amount of sleep we get may influence our risk of developing Alzheimer’s disease. Now, a study suggests that people who take significantly ...