Sleep refreshes the body and the brain. Learn about why we sleep, brainwaves and REM sleep, the dangers of not getting enough sleep and dreams.

Sleep deprivation can result in irritability, hallucinations, and even death. Learn more about sleep deprivation and how sleep repairs the body and the brain.

Sleep disorders include any difficulties relating to sleep. More than 100 sleeping disorders are divided into 4 groups. Learn about sleep disorder types, causes, symptoms, tests ...

Sleep apnea is a sleeping disorder causing stopped breathing during sleep resulting in snoring and labored breathing. Learn about sleep apnea causes, symptoms, tests, treatment and ...

Brain activity during sleep cycles fluctuates between REM sleep and two slower patterns. Learn about brain activity, REM sleep, dreams and medicine’s effect on sleep.

Learn about Sleep apnea. Read our encyclopedia entry on Sleep apnea. ... Please copy/paste the following text to properly cite this How Stuff Works article:

For more sleeping in space information and tons of articles on life in space, try this page. ... Please copy/paste the following text to properly cite this How Stuff Works article:

What are the odds you will get enough sleep on an average night?

Sleep Videos investigate the ways our bodies and lives are impacted by sleep. Learn about common sleep problems and sleep disorders in these videos.

You might wonder how astronauts sleep in space, what with the lack of gravity. Do they just float? Learn how astronauts sleep in space.

Whale sleep patterns are different from land mammals in that they are never really unconscious when they sleep. Learn about whale sleep patterns.

For more whale sleep pattern information and information on related topics, check out these links.

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To answer this, we need to look at some basics about sleep. The amount you need depends on your age. A newborn baby might sleep 20 hours a day while a 4-year old might need only 12 ...

Please copy/paste the following text to properly cite this How Stuff Works article: ... chemical that acts as a calming agent in the brain and plays a key role in sleep.

Please copy/paste the following text to properly cite this How Stuff Works article: ... For most people, the hardest part of yo-yoing is getting the spool to sleep long ...

Please copy/paste the following text to properly cite this How Stuff Works article: ... Insomnia, ihn SOM nee uh, is the inability to sleep naturally. Nonmedical people often ...

Please copy/paste the following text to properly cite this How Stuff Works article: ... But there was nowhere for them to sleep. They had to go to a stable and sleep with ...

Please copy/paste the following text to properly cite this How Stuff Works article: ... The idea behind these yo-yos is to make it easier for the yo-yo to sleep.

Watch this video about sleep apnea on HowStuffWorks. If you wake up fatigued or wake up frequently during the night, you may have sleep apnea. Learn how to treat this condition and ...

Please copy/paste the following text to properly cite this How Stuff Works article: ... Long-term sleep deprivation causes drowsiness, difficulty concentrating, and ...

... Lung, and Blood Institute, July 2006. [PDF] Horlicks - Malt powder manufacturer provides explanation of poor sleep patterns, and offers management tips. HowStuffWorks : How Sleep ...

Do you sleep well or do you have a sleep problem? Take Discovery Health's Sleep Quiz ... HowStuffWorks | TreeHugger | Petfinder | PetVideo | Discovery Education. Visit the Discovery Store: ...

Read a personal sleep apnea article from one sleep apnea sufferer's point-of-view. ... HowStuffWorks | TreeHugger | Petfinder | PetVideo | Discovery Education. Visit the Discovery Store: ...