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Sleep is the natural state of bodily rest observed in humans and other animals. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli while it is more easily reversible than coma. It is common to all mammals and birds, and is also seen in many reptiles, amphibians, and fish. In humans, other mammals, and a substantial majority of other animals that have been studied (such as some species of fish, birds, ants, and fruit flies), regular sleep is essential for survival. The purposes of sleep are only partly clear and are the subject of intense research.

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Wikipedia About Asleep

Sleep is the natural state of bodily rest observed in humans and other animals. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli while it is more easily reversible than coma. It is common to all mammals and birds, and is also seen in many reptiles, amphibians, and fish. In humans, other mammals, and a substantial majority of other animals that have been studied (such as some species of fish, birds, ants, and fruit flies), regular sleep is essential for survival. The purposes of sleep are only partly clear and are the subject of intense research.

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Stages of sleep

In mammals and birds, sleep is divided into two broad types: Rapid Eye Movement (REM) and Non-Rapid Eye Movement (NREM or non-REM) sleep. Each type has a distinct set of associated physiological, neurological, and psychological features. The American Academy of Sleep Medicine (AASM) further divides NREM into three stages: N1, N2, and N3, the last of which is also called delta, or slow-wave, sleep (SWS). Sleep cycles through the night, with deep sleep early on and more REM (marked in red) toward morning. thumb|165px|right|Stage N3 sleep. EEG highlighted by red box.

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Sleep proceeds in cycles of REM and NREM, the order normally being N1 → N2 → N3 → N2 → REM. There is a greater amount of deep sleep (stage N3) early in the night, while the proportion of REM sleep increases later in the night and just before natural awakening.

The stages of sleep were first described in 1937 by Alfred Lee Loomis and coworkers, who separated the different EEG features of sleep into five levels (A to E), which represented the spectrum of wakefulness to deep sleep. In 1953, REM sleep was discovered as distinct, and thus William Dement and Nathaniel Kleitman reclassified sleep into four NREM stages and REM. The staging criteria were standardized in 1968 by Allan Rechtschaffen and Anthony Kales in the "R&K sleep scoring manual." In the R&K standard, NREM sleep was divided into four stages, with slow-wave sleep comprising stages 3 and 4. In stage 3, delta waves made up less than 50% of the total wave patterns, while they made up more than 50% in stage 4. Furthermore, REM sleep was sometimes referred to as stage 5.

In 2004, the AASM commissioned the AASM Visual Scoring Task Force to review the R&K scoring system, which culminated in several changes, the most significant being the combination of stages 3 and 4 into Stage N3. This was published in 2007 as The AASM Manual for the Scoring of Sleep and Associated Events. Arousals and respiratory, cardiac, and movement events were also added.

Sleep stages and other characteristics of sleep are commonly assessed by polysomnography in a specialized sleep laboratory. Measurements taken include electroencephalography (EEG) of brain waves, electrooculography (EOG) of eye movements, and electromyography (EMG) of skeletal muscle activity. In humans, each sleep cycle lasts from 90 to 110 minutes on average, and each stage may have a distinct physiological function. Drugs such as sleeping pills and alcoholic beverages can suppress certain stages of sleep, leading to sleep deprivationFact: date=January 2009. This can result in sleep that exhibits loss of consciousness but does not fulfill its physiological functions (i.e., one may still feel tired after otherwise sufficient sleep). REM and slow-wave sleep are both homeostatically driven; people and most animals selectively deprived of one of these stages will rebound once uninhibited sleep is allowed.Fact: date=March 2009 This finding suggests that both these stages are essential.

Search results for Asleep

How to Fall Asleep - wikiHow

... about How to Fall Asleep. ... room can be calming when trying to fall asleep. ... When you don't fall asleep in half an hour get up and do a low active ...www.wikihow.com/Fall-Asleep

Deals: Nendels Inn, Sparks - TripAdvisor

Nendels Inn, Sparks, NV: Asleep? - Visit TripAdvisor for unbiased traveler reviews of Nendels Inn. ... Asleep? Traveler rating: 1 of 5 stars I requested a wake ...www.tripadvisor.com/ShowUserReviews-g46002-d92099-r2205294-N...

Asleep | Barnes & Noble.com

Find Asleep and much more at BN.com. Free 3-Day Delivery on orders over 25 dollars.search.barnesandnoble.com/Asleep/Banana-Yoshimoto/e/97808021...

Guide to Healthy Sleep on MedicineNet.com

Read about how to get a healthy nights sleep, how much sleep is enough, and why skimping on sleep can lead to ... you usually fall asleep within the first five ...www.medicinenet.com/sleep/article.htm

Asleep at the Wheel

Official site for the western swing band.www.asleepatthewheel.com/

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News about Asleep

Sebastian girl, 4, found safe at neighbor's after caretaker drinks beer, falls asleep

Vero Press JournalLuke Carl Barry told police he woke up at 8 p.m. Wednesday after drinking beer throughout the afternoon, and could not find the little girl in the home. When he couldn't find the 4-year-old, he contacted police. http://tcpalm.com/news/2008/oct/02/sebastian-girl-4-found-sa...

Infant injured by toddlers

The Cincinnati EnquirerA 6-week-old infant was injured by two toddlers after the caregiver fell asleep and failed to watch the children, Cincinnati police allege.http://news.cincinnati.com/apps/pbcs.dll/article?AID=/200810...

Cigarette Caused Morning House Fire

WJAC 6 JohnstownLeo Barkley of Adams Township fell asleep while smoking. The cigareete caused a fire that destroyed his home. INSIDE: Video coveragehttp://www.wjactv.com/news/17601476/detail.html?rss=john&psp...

Effort targets black SIDS

Pittsburgh Post-GazetteTwo years ago, Nikkia Albert of Hazelwood put her 2-month-old son on the couch alongside his father, and all seemed well. A short time later, Ms. Albert thought her son, Mustafa, was sound asleep, only to realize he was not moving.http://www.post-gazette.com/pg/08276/916729-114.stm?cmpid=lo...

Man charged with crime one year after fatal crash

Wausau Daily HeraldA teen who said he fell asleep while driving before a 2007 fatal crash was charged Wednesday with homicide by negligent operation of a vehicle.http://www.wausaudailyherald.com/apps/pbcs.dll/article?AID=/...

News about Asleep

HBO's 'Alzheimer's Project' series explores the disease

Los Angeles TimesI wake up some mornings and don't know whether I've been asleep at all," Alzheimer's patient June Vasse, 63, says in "Momentum in Science." Larger and larger swaths of memory disappear over time, often leaving odd bits and pieces, like song lyrics or ... http://www.latimes.com/entertainment/news/la-ca-alzheimers10...

Arts and minds at the Tate

The IndependentWhen she was younger she'd be like awake but asleep. She'd scream and it would go on for, oh, an hour or so in the night and she'd be so terrified. She'd look at me like I was a monster with two heads. When she went to the psychiatrist at 16, she did ... http://www.independent.co.uk/arts-entertainment/art/news/art...

GOING SOLO, GOING GREEN

Minneapolis Star TribuneI've fallen asleep here at 5 and been woken up at 7 by the contractors showing up for their day," he said. By the time the family moved in in July 2008, there was still a lot of work left. The master bathroom was unfinished, the basement wasn't done ... http://www.startribune.com/lifestyle/44608232.html?elr=KArks...

House of shame

Guardian UnlimitedThere used to be a code that, if you left your wastepaper bin across the door, the cleaners didn't disturb you because they knew you were asleep," recalls Nick Harvey, a Liberal Democrat MP and chairman of the House of Commons commission, who was ... http://www.guardian.co.uk/politics/2009/may/10/houseofcommon...

Sun, sand and savagery: Whatever happened to Jamaica, paradise island?

The IndependentMaster Taylor's asleep," he announced, "but he soon come." Taylor emerged from his slumbers, a thin man bent almost double with age, yet still every inch the "buckra", or white sugar boss. He gestured for me to sit down in a room whose ... http://www.independent.co.uk/travel/americas/sun-sand-and-sa...

Search results for Asleep

asleep - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.

asleep at the switch. Fig. not attending to one's job; failing to do one's duty at the proper time. (Alludes to a technician or engineer on a train sleeping instead of turning ... http://idioms.thefreedictionary.com/asleep

asleep - definition of asleep by the Free Online Dictionary, Thesaurus ...

a·sleep (-sl p) adj. 1. In a state of sleep; sleeping. 2. a. Inactive; dormant. b. Indifferent: politicians who are asleep to the needs of their constituents.http://www.thefreedictionary.com/asleep

asleep - definition of asleep in the Medical dictionary - by the Free ...

a·sleep (-sl p) adj. 1. In a state of sleep; sleeping. 2. Numb, as of a limb. 3. Dead. adv. 1. In or into a state of sleep. 2. In or into a state of apathy or indifference.http://medical-dictionary.thefreedictionary.com/asleep

Excerpt: 'Why Do Men Fall Asleep After Sex?' - Sexual health- msnbc ...

The new book "Why Do Men Fall Asleep After Sex" addresses the odd, icky and just plain embarrassing, written by the authors of the best-seller "Why Do Men Have Nipples?"http://www.msnbc.msn.com/id/14029754/

How to Fall Asleep - wikiHow

wikiHow article about How to Fall Asleep. ... Your mind is racing and you can't seem to get it to stop, but you don't want to become addicted to those sleeping pills they are ... http://www.wikihow.com/Fall-Asleep

Wikipedia results for Asleep

Asleep at the Wheel - Wikipedia, the free encyclopedia

Asleep at the Wheel, is a multiple Grammy Award-winning Country / Western Swing [1] band formed in Paw Paw, West Virginia, [2] but based in Austin, Texas.http://en.wikipedia.org/wiki/Asleep_at_the_Wheel

Sleep - Wikipedia, the free encyclopedia

A person's major sleep episode is relatively inefficient and inadequate when it occurs at the "wrong" time of day; one should be asleep at least six hours before the lowest body ... http://en.wikipedia.org/wiki/Asleep

Asleep in the Back - Wikipedia, the free encyclopedia

Asleep in the Back is the debut album by the band Elbow, released in May 2001. The title track, "Asleep in the Back," was included as a bonus track on later editions of the album ... http://en.wikipedia.org/wiki/Asleep_in_the_Back

Asleep in the Bread Aisle - Wikipedia, the free encyclopedia

Asleep in the Bread Aisle is the debut studio album by American rapper Asher Roth. It was released on April 20, 2009. [2] The album's first single is "I Love College ". [3]http://en.wikipedia.org/wiki/Asleep_in_the_Bread_Aisle

Asleep (album) - Wikipedia, the free encyclopedia

Asleep is the second EP release from Bleed the Dream on their self-label Maphia in 2006. Track listing "Should Have Known" - 3:49 "Shattered Memories" - 3:27http://en.wikipedia.org/wiki/Asleep(album)
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Videos found for Asleep

FHP: Passengers Ejected After Drive...

FHP: Passengers Ejected After Driver Fell AsleepThe Florida Highway Patrol says the driver of the SUV that killed a teacher after it rolled over, had fallen asleep at the wheel.Windows Media - Video

kitty fell asleep....

kitty fell asleep....cuteFlash - Video

Truck Driver Falls Asleep At The Wh...

Truck Driver Falls Asleep At The WheelA truck driver dozes off while driving down the highway. The road makes a pretty sharp turn and the driver slams into a metal barrier causing his truck to swerve out of control.MPEG 4 - Video

Asleep at the wheel

Asleep at the wheelFeb. 13: Oddball: In Pattaya, Thailand hundreds of revelers participate in the annual bed race by pushing bedroom furniture down the town's main street. (Countdown)Windows Media - Video

Puppies falling asleep: they're cut...

Puppies falling asleep: they're cute and they're tiredThey can't even stay awake for the cameras - the funniest, sleepiest dogs on the web.Flash - Video

Answers for Asleep

kenilworthHow can I NOT fall asleep during a play or performance?kenilworthMost operas are actually quite enjoyable if you understand the plot line and the character's personalities. I suggest that you take some time to prepare yourself for this experience. First, find ...iRockHow do I disguise falling asleep in class?iRockClose one eye at a time and draw/paint an eyeball on each of your eyelids. This way when you're asleep, nobody will notice...unless you are one of those people that snores real loud, then you're outt...Tanisha HWhat are some ways to make you fall asleep and stay asleep?Tanisha He3790lementI have a lot of trouble falling asleep at night, what adive do you have to fall asleep quickly?e3790lementI was also having problems falling asleep, doing so around 3-4am, au aunt told me about Melatonin, its a natural pill. i tried it...and literally about 30-60 minutes later i could barely keep my eyes ...LBCgalHow can I fall asleep without taking sleeping pills?LBCgal
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