1. Health

Sleep Disorder Basics

General information about what sleep disorders are and how they develop, causes and symptoms of common sleep disorders, the prevalence of sleep disorders in the general population, risk factors for developing sleep disorders, and a discussion of who gets sleep disorders and why.

Pupil Size Can Objectively Identify Sleepiness, Sleep Deprivation
Learn how pupil size as measured with a test called pupillometry can be used to objectively identify sleepiness and the degree of sleep deprivation.

Understanding the Basics of Sleep Stages
To appreciate how various sleep disorders occur, and the function of normal sleep, it is necessary to have an understanding of the basics of sleep stages. These include the pattern called sleep architecture and the two main subtypes of NREM and REM sleep. Learn about these concepts and better understand what it is to sleep.

How does sleep inertia make it hard to wake up?
It is something that you may experience nearly every morning when you wake up: that compelling, nearly irresistible desire to go back to sleep. What is sleep inertia and how does it make it hard to wake up?

Brain Basics: Understanding Sleep
Learn about the basics of sleep from the National Institute of Neurological Disorders and Stroke. Find out how much sleep we need, what sleep does for us, what the common sleep disorders are, and some tips for improved sleep.

CDC's Sleep and Sleep Disorders
Explore some of the basics of sleep with the Centers for Disease Control and Prevention. Learn about sleep needs, sleep hygiene, and common sleep disorders.

FDA's Sleep Disorders Fact Sheet
The Office of Women's Health in the Food and Drug Administration provides basic information regarding sleep disorders common among women.

Sleep Education
The American Academy of Sleep Medicine provides an excellent collection of summaries of the common and uncommon sleep disorders. This is a superb resource and a great place to start learning about sleep!

Sleep Disorders Tutorial
This interactive tutorial from the National Institutes of Health provides a basic framework to understand sleep disorders. It is a good place to start.

Words to Expand Your Sleep Vocabulary
Improve your understanding of sleep by expanding your sleep vocabulary with these 15 terms.

Why Do We Sleep?
You did it today. You've probably done it nearly every day of your life. In fact, you'll spend one third of your life doing it. So why do we sleep?

What is Sleep Architecture?
If you have ever been curious about the structure of sleep, you may want to learn about a concept called sleep architecture. This idea helps us to understand the pattern of the stages of sleep, how this changes as we get older, and what impact sleep disorders may have.

Do Blind People Dream?
What do blind people dream? Can they see when they are dreaming? Learn how blind people's dreams may differ from those who can see and how the age at which they became blind affects this.

What Is Fatigue?
What is fatigue? How does it differ from sleepiness? Learn the definition of fatigue and what medical conditions may be the underlying cause, including disorders such as insomnia and chronic fatigue syndrome.

What Is Sleepiness?
What is sleepiness? How does sleepiness differ from fatigue or tiredness? Consider the possible causes of feeling too sleepy, including the role of sleep disorders such as sleep apnea or narcolepsy.

Do Cats and Dogs Dream?
If you have observed your pets as they sleep, you may questions: Do cats and dogs dream? Learn whether your pet may be dreaming while it sleeps.

Why Am I Sleepy After Eating Lunch?
If you return to work after lunch, you may feel especially sleepy and wonder: Why am I sleepy after eating lunch? Learn why this occurs and whether it relates to the food you eat or instead is due to natural patterns of wakefulness and sleepiness called the circadian rhythm. In addition, you can learn a few ways to counteract this desire to fall...

Surprising Signs of Insomnia

10 Surprising Signs of Sleep Apnea

What Is Non-24-Hour Sleep-Wake Disorder?

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