You’ve heard of REM sleep but what about deep sleep? Experts share why it’s important and how to make sure you’re getting ...

Wondering how much sleep is right for your baby can feel tricky. In the first weeks, babies sleep a lot, but the exact amount ...

7-9 hours remains the guideline, but not everyone needs that much sleep. Some need less, some need more. Sarah Mitroff/CNET If you find yourself asking, “How much sleep do I need?” you’re not alone.

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

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Up to one in three Americans don’t get enough sleep, and millions struggle with actual sleep disorders.