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Health | Mental Health | Sleep Disorders

From insomnia to narcolepsy, sleep disorders include any abnormality in a person's sleep patterns. Learn about the diagnosis and symptoms of sleep disorders, and find out how they can be treated.


How Fever Dreams Work

 How Fever Dreams Work

They're not hallucinations, but they're not just regular nightmares, either. Learn how fever dreams work at HowStuffWorks.com. See more »

How Night Terrors Work

 How Night Terrors Work

Do you still experience horrific sleep visions? Don't worry, you'll grow out of it – hopefully. Learn all about night terrors at HowStuffWorks. See more »

How Fatal Familial Insomnia Works

 How Fatal Familial Insomnia Works

Fatal familial insomnia is a rare genetic variation of the debilitating sleeping disorder. Learn more about FFI at HowStuffWorks. See more »

How Sleep Deprivation Works

 How Sleep Deprivation Works

Pulled an all-nighter last night? You're a danger to yourself and others. Find out why sleep deprivation is such a hazard. See more »

How Insomnia Works

 How Insomnia Works

As many as 10 percent of adults are experiencing mild insomnia at any time. Find out what causes this extremely common condition and what might help. See more »

Will you EVER get back to sleep? The Insomnia Quiz

 Will you EVER get back to sleep? The Insomnia Quiz

Don't count sheep! Test you knowledge about falling -- and staying -- asleep. See more »

Do you need sleep drugs?

 Do you need sleep drugs?

Do you need drugs to help you sleep? Find out if you need sleep drugs in this excerpt from 'You: Staying Young'. See more »

Zzzzzzzzzzz … How much do you know about sleep apnea?

 Zzzzzzzzzzz … How much do you know about sleep apnea?

How much do you know about sleep apnea? Find out if you're at risk for sleep apnea by taking this quiz. See more »

Does sleep deprivation lead to risky decisions?

 Does sleep deprivation lead to risky decisions?

Does sleep deprivation lead to risky decisions? Some research shows we can make bad choices when tired. Learn about sleep deprivation and risky decisions. See more »

10 Signs You May Be Sleep Deprived

 10 Signs You May Be Sleep Deprived

Are you sleep deprived? About 45 percent of the world's population isn't getting enough sleep. See 10 signs you might be sleep deprived. See more »