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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.

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9 Most Common Sleep Disorders

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


Social Jet Lag May Be Bad for Your Heart

A new study links sleeping in on the weekends with an increased likelihood of heart disease.

How Fever Dreams Work

They're not hallucinations, but they're not just regular nightmares, either.

How Night Terrors Work

Don't worry, you'll grow out of it – unless you're among the tiny percent of adults who still experience horrific sleep visions. Learn all about night terrors at HowStuffWorks.

How Fatal Familial Insomnia Works

Insomnia can feel like torture, but can it be fatal? The answer is yes, but it's an incredibly rare neurodegenerative disease, normally passed down genetically.

How Sleep Deprivation Works

You know you're not yourself when you don't get enough sleep, but what really happens to your body when the sandman refuses to visit?

How Insomnia Works

Can't sleep? Tossing and turning? Join the crowd. Insomnia is all too common -- but what's keeping so many people from getting the rest they need?

Do you need sleep drugs?

For some people, medications or herbal supplements can be the answer to sleep problems — if you know the right one. This guide will help you and your doctor make the decision that's right for you.

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.

10 Signs You May Be Sleep Deprived

The statistics are alarming: According to the World Association of Sleep Medicine, about 45 percent of the world's population isn't getting enough sleep.

9 Most Common Sleep Disorders

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