This article is a part of CNN Underscored’s Guide to Sleep, a weeklong focus on everything you need to sleep better. We’ll be featuring new products, tips and exclusive deals all week, so check in ...

Researchers found that missing a single night of sleep can quickly affect key parts of the immune system. The study found important immune cells became overactive after sleep loss. Researchers say ...

While sleep is universally acknowledged as vital to health, how much we should and do sleep depends heavily on culture, geography, and social expectations. What’s “just right” in Japan might leave you ...

I am envious of my partner, who is out like a light as soon as she hits the pillow. On most nights, that's by 10 p.m. I have always had a tough time falling asleep. It can be hours after lights-out ...