2021年12月3日 · When you sleep, your body rests, recovers and rebuilds itself through four stages. Here’s how much sleep you need to feel rested.

2024年5月7日 · Below, you’ll learn how to calculate the best time to go to bed based on your wake time and natural sleep cycles. We’ll also offer more insight into how sleep cycles work and why sleep, or...

2025年1月18日 · Find out how much sleep you need at every stage of life with this expert advice on sleep needs by age. Sleep is often called the “reset button” for the body and brain. It’s when your body repairs tissues, consolidates memories and balances hormones. It also strengthens your immune system, improves mood, and sharpens cognitive function.

2023年6月19日 · When you’re asleep, your body “powers down” and most body systems — including your brain — become less active. Some of the key things that happen while you’re asleep include: Energy conservation and storage. During the day, cells throughout your body use stockpiled resources to keep doing their jobs. While you’re asleep, your body uses less energy.

2025年1月2日 · When you sleep, your body takes time to: Sleep can be divided into 2 phases — non-rapid eye movement (NREM) and rapid eye movement (REM) — and 4 stages that make a complete cycle. You’ll...

What exactly does sleep do for your body and mind? Here’s what researchers know about the science of sleep—including the stages of sleep, your biological clock, health connections and more.

2009年12月22日 · When you sleep, your body undergoes a series of changes that enable the rest that is vital to your overall health. Sleep allows the brain and body to slow down and engage in processes of recovery, promoting better physical and …

2023年10月30日 · On average, how many hours do you sleep each night? For most healthy adults, guidelines suggest at least seven hours of slumber. But these are general recommendations and not strict rules. "Some people need less than seven hours, while others might need more," says Eric Zhou with the Division of Sleep Medicine at Harvard Medical School.

2024年9月5日 · There are two basic types of sleep: rapid eye movement (REM) sleep and non-REM sleep. Within non-REM sleep, scientists have identified three different stages. Each is linked to specific brain waves and neuronal activity.

2024年12月10日 · Deep sleep, like all sleep stages, helps you feel refreshed when you wake up. The proportion of time you need to spend in each sleep stage varies with age. Adults need around 20% to 25% of total sleep time in deep sleep, which comes out to a total of one to two hours of deep sleep per night.