Here’s what you’ll learn when you read this story: We have evolved a sleep cycle that goes from non-REM to REM sleep and back again, but until now, the biological function of this oscillation was ...

Chronic insomnia needs evidence-based care, not pills or products. Consistent habits, CBT-I, and understanding sleep—not chasing metrics—create real, lasting improvement.

Imagine what else you could do with the hours you spend unconscious each night. Oh, the things you could accomplish! But if you’re trying to claw back more of your personal time, sacrificing sleep is ...

“In general, people sleep better when it’s cooler,” says Johnson. However, if it’s cold outside and we jack up the heat, then ...