The American Sleep Association's mission is to help increase sleep awareness, support organizations in their efforts to do the same, and improve the sleep of millions.

Evidence-backed information investigating the curious world of sleep.

National Sleep Foundation has been the leading expert voice in the world of sleep science and health for nearly thirty years. Since 1996, SleepFoundation.org has served as the public face of the nonprofit, a platform for its acclaimed Sleep in America poll, as well as the sleep education and advocacy programs that remain the cornerstone of the Foundation’s work.

People progress through a series of distinct physiological stages during sleep. Each stage of sleep serves an important purpose in keeping your brain and body healthy.

This article covers the basics of the sleep cycle, what is happening when each sleep stage occurs, and what can affect your ability to move through these stages as you should.

Explores the stages of sleep, discusses sleep disorders, plus tips for getting better sleep.

Sleep apnea is a potentially serious sleep disorder in which breathing repeatedly stops and starts. If you snore loudly and feel tired even after a full night's sleep, you might have sleep apnea.

Insomnia is a common sleep disorder that can make it hard to fall asleep, hard to stay asleep, or cause you to wake up too early and not be able to get back to sleep. You may still feel tired when you wake up.

Restless legs syndrome (RLS) is a condition that causes an uncontrollable urge to move the legs, usually because of an uncomfortable sensation. It typically happens in the evening or nighttime hours when you're sitting or lying down.

Narcolepsy is a chronic sleep disorder characterized by overwhelming daytime drowsiness and sudden attacks of sleep. People with narcolepsy often find it difficult to stay awake for long periods of time, regardless of the circumstances.

An overview of why teens face unique sleep challenges and tips to help them sleep better.

Teenagers need more sleep than adults or their younger siblings, yet they almost always seem sleep deprived.

According to the Centers for Disease Control and Prevention, about 41 million Americans get six or fewer hours of sleep per night. For teens, it's even worse.

Most people today go to bed with their cell phone, tablet, laptop, or television to keep them company. Unfortunately, the result of that can be a long night of wakefulness prompted by the light from these devices along with the stimulating mental activity required to play games, watch movies, or take care of last-minute work-related emails before turning in.

Working out is great for your body and mind – and it can also help you get a good night’s sleep. But, for some people, exercising too late in the day can interfere with how well they rest at night.

In what ways does caffeine affect sleep, and are there benefits to using caffeine as a way to increase alertness and/or reaction time?