During sleep, the body goes through multiple sleep cycles. Each cycle consists of four stages: three stages of non-rapid eye movement (non-REM) sleep and one stage of rapid eye movement (REM) sleep. A ...

Sleeping for 7 to 9 hours at night isn't the only way to catch some z's. Here are four alternative sleep cycles -- and they're pretty obscure. Annie Miller Medical Reviewer Annie Miller is a licensed ...

Ever wonder why some mornings you wake up ready to go, and others you feel like a zombie? The difference often comes down to when you wake up during your sleep cycle, and that’s exactly what a sleep ...

During sleep, your body cycles through 4 stages and 2 phases, all of which contribute to your overall health. Quality sleep is important for your memory, immune system, muscles, and more. Sleep is one ...

The internet claims waking at the end of a sleep cycle will leave you refreshed, but experts aren’t convinced. By Clarissa Brincat Published Sep 9, 2025 9:00 AM EDT Image: DepositPhotos Get the ...

Forbes contributors publish independent expert analyses and insights. Dr. Judy Stone focuses her writing on infectious diseases. While women are said to sleep a bit longer than men, their sleep ...

We’ve all been there — dragging ourselves out of bed feeling like we’ve been hit by a truck despite getting a full night’s sleep. The alarm blares, and you wonder how eight hours of rest could ...

You're newly postpartum, lying down in bed just hoping your baby drifts off to sleep soundly for the night so you can get a few hours of sleep. You watch their eyes close and little chest go up and ...

Is there some science in these old-school myths? When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Does the full moon change how we sleep? Does it ...