But how do sleep cycles work? To find out, I took part in a polysomnography. This is a gold standard sleep study that helps ...

"Deep sleep builds your immune system, and REM sleep regulates and fine-tunes it," says Darwall-Smith agrees. During deep ...

Most people spend a third of their lives sleeping, but you may need more or less than eight hours a night. The amount of ...

Drinking alcohol might appear to help you fall asleep initially, but it diminishes your quality rest. These nighttime tips ...

It’s also when “growth hormone” is released. In the latter hours of the night, more of the sleep cycle is spent in rapid-eye movement sleep, or dream sleep, which is important for learning ...

I wasn’t sleeping well, so I took Thorne’s Sleep Test to uncover the cause. Here's what I learned about my out-of-whack ...

Discover seven strategies to improve sleep quality naturally, from optimizing your bedroom environment to timing exercise ...

This sleep gadget is seriously next-level. It tracks your deep, light, and REM sleep cycles, giving you in-app analytics and a daily Sleep Score to help you perfect your rest. The E! Insider Shop ...

Most adults need between seven to nine hours of sleep, and the quality of sleep is just as important as the quantity, with ...

Do you find yourself reaching for an alcoholic drink to unwind and drift off to sleep? Whether it's an old-fashioned, a hot ...