Like HowStuffWorks on Facebook!

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.

Does sleep deprivation lead to risky decisions?

Research shows that when we've had too little sleep, our brain activity makes us overly optimistic, so we make some bad choices.

How Fever Dreams Work

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

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

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

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

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 »

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 »

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

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 »

9 Most Common Sleep Disorders

Think you might have a sleep disorder? Learn more about the 9 most common sleep disorders. See more »

Sleep apnea causes patients to actually stop breathing periodically throughout the night. Learn about the silent dangers of sleep apnea. See more »