Discover why sleep is more powerful than you think—and how a lack of it can quietly impact everything from your mood to long‑term brain health.

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 ...

New evidence is highlighting just how important sleep is for overall health. Emerging research published in The Journal of Immunology found a link between sleep deprivation and the immune system, and ...

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 ...

Out of all human necessities, it’s not hard to make a case for sleep. The Average person spends 26 years sleeping, which is equivalent to a third of our lives. Beyond that, it’s considered one of the ...

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 ...

We challenged each other to survive 24 hours inside an epic church gym, competing in everything from strength and flexibility to balance and pure willpower. The twist? If you fail a challenge, the ...