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Title: Conditions and Diseases/Sleep Disorders - HowStuffWorks : How Sleep Works An introduction to how sleep works, why it is needed and how to improve it.
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How Sleep Works

by Marshall Brain Print $("#hpad").empty(); $("#hpprint").mouseover(function(){ if ($("#hpad").html() == "") { $.ajax({ type: "GET", url: "/hp-ajax-ad-creative.htm", success:function(html) { $("#hpad").html(html); } }); } $("#hpad").show(); }).mouseout(function(){ $("#hpad").hide(); }); Email Cite Feedback Share Digg ThisYahoo! BuzzStumbleUpondel.icio.usReddit Cite This! Close  Please copy/paste the following text to properly cite this HowStuffWorks article:Brain, Marshall.  "How Sleep Works."  01 April 2000.  HowStuffWorks.com. <http://health.howstuffworks.com/sleep.htm>  22 November 2008. Inside this Article Introduction to How Sleep Works Sleep and the Brain Missing Sleep Dreams and Improving Sleep Habits Lots More Information See all Sleep articles Anniversary for Alarm Clock Snooze Bar Anniversary for Alarm Clock Snooze Bar Play Video More Health Videos » Sleep is one of those funny things about being a human being -- you just have to do it. Have you ever wondered why? And what about the crazy dreams, like the one where a bad person is chasing you and you can't run or yell. Does that make any sense? Sleeping Pictures stages of <b>sleep</b>Dreaming occurs in the fifth stage of sleep. See more sleeping pictures. If you have ever wondered about why people have to sleep or what causes dreams, then read on. In this article, you'll find out all about sleep and what it does for you. Characteristics of SleepWe all know how sleep looks -- when we see someone sleeping, we recognize the following characteristics: If possible, the person will lie down to go to sleep. The person's eyes are closed. The person doesn't hear anything unless it is a loud noise. The person breathes in a slow, rhythmic pattern. The person's muscles are completely relaxed. If sitting up, the person may fall out of his or her chair as sleep deepens. During sleep, the person occasionally rolls over or rearranges his or her body. This happens approximately once or twice an hour. This may be the body's way of making sure that no part of the body or skin has its circulation cut off for too long a period of time. In addition to these outward signs, the heart slows down and the brain does some pretty funky things (we'll get to this later). In other words, a sleeping person is unconscious to most things happening in the environment. The biggest difference between someone who is asleep and someone who has fainted or gone into a coma is the fact that a sleeping person can be aroused if the stimulus is strong enough. If you shake the person, yell loudly or flash a bright light, a sleeping person will wake up. For any animal living in the wild, it just doesn't seem very smart to design in a mandatory eight-hour period of near-total unconsciousness every day. Yet that is exactly what evolution has done. So there must be a pretty good reason for it!Pondering Sleep:Do whales and dolphins sleep?Is sleep that important?How can someone stay awake for 11 days?­­Reptiles, birds and mammals all sleep. That is, they become unconscious to their surroundings for periods of time. Some fish and amphibians reduce their awareness but do not ever become unconscious like the higher vertebrates do. Insects do not appear to sleep, although they may become inactive in daylight or darkness. By studying brainwaves, it is known that reptiles do not dream. Birds dream a little. Mammals all dream during sleep. Different animals sleep in different ways. Some animals, like humans, prefer to sleep in one long session. Other animals (dogs, for example) like to sleep in many short bursts. Some sleep at night, while others sleep during t­he day. Sleep has a profound effect on your brain, which we'll examine in the next section. ­­­ Next Page Inside this Article Introduction to How Sleep Works Sleep and the Brain Missing Sleep Dreams and Improving Sleep Habits Lots More Information See all Sleep articles digg_url = 'http://health.howstuffworks.com/sleep.htm'; digg more Yahoo! Buzz buzz more stumble_url = "http://health.howstuffworks.com/sleep.htm" Related Ad Categories /* '); document.write(''); for (i = 0; i < 3; ++i) { document.write('' + radlinks[i].term + ''); } document.write(''); document.write(''); for (i = 3; i < radlinks.length; ++i) { document.write('' + radlinks[i].term + ''); } document.write(''); document.write('');}var ads = new Array;google_ad_output = 'js';google_ad_client = 'ca-howstuffworks_radlinks_js';google_ad_channel = 'health-Article';google_safe = 'high';google_num_radlinks = 5; // Number of radlink terms to returngoogle_max_radlink_len = 23;google_max_num_ads = '0';google_prev_ad_formats = '';/* ]]> */ Related Ad Links Symptom Checker Diseases A-Z Learn more about what ails you. Here are some common symptoms. Common Symptoms: See all » Back Pain Breast Lump Chest Pain Chills Dizziness Dry Skin Fever Joint Pain Rash Sunburn Symptom Checker Diseases A-Z A comprehensive guide with three thousand articles, including images and multimedia. Common Conditions: See all » Arthritis Asthma Cancer Depression Diabetes Headache Heart Disease Osteoporosis Parkinson's Disease Stroke Related ContentExplanationsHow Dreams WorkHow Hypnosis WorksIs there something in turkey that makes you sleepy? Prices: Pillows Daniadown Deluxe Pillow Authorized Daniadown Dealer. A deluxe pillow of white cotton and available in several finishes. The Daniadown Deluxe Pillow is a blend of luxury and v...$50.99 See It Quilted Biala the Butterfly Children's Decorative Throw Pillow Biala the Butterfly gently flutters against a lilac background. This colorful kids' pillow is made from sturdy quilted poly cotton blend. The quilted ...$14.95 See It Fantasy Bolster Pillow Wrapped is soft faux fur, this pink bolster pillow is adorable. Use with your existing bedding ensemble or mix an match with the other Fantasy series ...$19.91 See It Search HowStuffWorks and the web Home|Adventure|Animals|Auto|Communication|Computer|Electronics|Entertainment|Food|Geography|Health|History|Home & Garden|Money|People|Science Company Info | Advertise With Us | Newsletter | Careers | Privacy | Contact Us | Help | Visitor Agreement | RSS HowStuffWorks | HSW Brazil | HSW China HowStuffWorks China © 1998-2008 HowStuffWorks, Inc. Discovery Communications, LLC | Discovery Channel | TLC | Animal Planet | Discovery Health | Science Channel | Planet Green | Discovery Kids Petfinder | TreeHugger | Military Channel | Investigation Discovery | HD Theater | FitTV | Turbo ATTENTION! We recently updated our privacy policy. The changes are effective as of Thursday, October 30, 2008. To see the new policy, click [here]. Questions? 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An

introduction

to

how

sleep

works,

why

it

is

needed

and

how

to

improve

it.

http://health.howstuffworks.com/sleep.htm

HowStuffWorks : How Sleep Works 2008 November

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An introduction to how sleep works, why it is needed and how to improve it.

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