Sleep cycle

Sleep has a very real impact on our health and performance.

Our nightly sleep is composed of a number of sleep cycles, each of which is made up of different stages. It is now understood that we pass through five stages of sleep as we fall from wakefulness, with REM sleep the final of these stages. #sleep

Use our sleep calculator to find your best bedtime based on age and your desired wake-up time.

WebMD explains the stages of sleep -- REM and non-REM -- and how age affects these cycles.

The 5 Stages Of Sleep Cycle. Understanding the Sleep Cycle and why it is not just about how many hours we manage to sleep. But why it is important that we reach the 5 Stages of the Sleep Cycle to get full health benefits?

The sleep cycle is divided into five distinct stages of sleep and each of these stages has its own effects on the body. Learn more.

Discover how to read and interpret your sleep-stage data with these tips from the scientists who helped develop it.

While a morning person is no better than a night owl, there is something to be said for getting those few extra morning hours to ourselves.

There are four sleep cycle stages in total, including light sleep, deep sleep, and rapid eye movement (REM). Learn how they affect the body.

There are four stages of sleep divided into two categories: REM sleep and non-REM (NREM) sleep. Learn what's going on in your brain during each stage.