REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

These differences aren’t just habits—they’re part of someone’s biology, and these differences can be grouped into a variety ...

A vast majority of Americans wake up regularly during the night, according to a U.S. News survey. Sleep expert Wendy Troxel ...

I can't get out of bed in the morning!' If this sounds familiar, you're experiencing what experts call 'sleep inertia. ' Discover why your morning grogginess isn't a character flaw but a treatable ...

Krista Figari woke up in her Manhattan apartment and made her bed like she did every morning — then disaster struck.

According to PSQI ratings, participants who received 2 grams of Spirulina daily for 8 weeks experienced a significant ...

After reading the comments, the owner has realized that there is a "universal" cat issue as other felines are doing the same.

For a good night of sleep, consider getting your circadian rhythm back in sync with the sun. Here’s how to do it.

— The best sleep environment is a cool, dark, quiet room. In noisy households, earplugs and a sleep mask can help. If a bedroom is too warm, it can affect getting to sleep and staying asleep, says ...

Obstructive sleep apnea happens when a structural problem makes it hard for you to breathe while asleep, causing you to wake up frequently. Although it may not cause obvious symptoms, it can harm ...

One in four Britons wakes up groggy daily. But experts say there are ways to combat feeling sluggish and disorientated ...

The best sunrise alarm clocks help you wake up gently and start your day energized. See our top picks from Hatch, Philips, ...