Add Yahoo as a preferred source to see more of our stories on Google. Person wearing a wearable sleep tracker in bed Light sleep is the beginning of your sleep cycle and your body's way of winding ...

REM stands for rapid eye movement — a stage in the sleep cycle when your brain is almost as active as when you’re awake. Getting enough REM sleep is crucial, as it helps you store information and ...

This sleep stage is incredibly important.

You did it! You finally won the lottery, and you're making plans to spend all that cash ... but then you're startled awake by your alarm clock. It was just a dream (sigh). Whether or not you remember ...

Sleep is often treated as downtime, a passive break between the real business of being awake. But a new study has revealed that sleep is active, essential biology, showing how the brain uses the night ...

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 ...

All the most commonly prescribed drugs for mental and emotional disorders affect dreams—typically via their effects on REM sleep. Under healthy conditions REM sleep ‘turns on' when activity levels of ...

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 ...

For those who find themselves thrashing about, kicking, or throwing punches in their sleep, it might be a sign of REM Sleep Behavior Disorder. This intriguing yet potentially troubling condition ...