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Sleep is the regular state of natural rest observed in all mammals, birds, and fish. Sleep is not actually "unconsciousness," but rather, it is a natural state of rest characterized by a reduction in voluntary body movement, decreased reaction to external stimuli, an increased rate of anabolism (the synthesis of cell structures), and a decreased rate of catabolism (the breakdown of cell structures). Therefore, since consciousness is literally the awareness of the surroundings, being asleep is just an altered state of consciousness, as opposed to being unconscious. It is heavily influenced by circadian rhythms and by hormonal and environmental factors. Sleep performs a restorative function for the brain and body as evidenced by the myriad symptoms of metabolic dysfunction that result when animals are deprived of sleep.
The function of sleep in health and in disease is being increasingly studied in specialized sleep laboratories throughout the world. Not only insomnia but more recently elucidated sleep disorders such as sleep apnea and narcolepsy are evaluated in such facilities. The increasing prevalence of sleep disorders is likely to be a function both of more sophisticated diagnostic tests and the disruption of the normal day-night cycle in modern societies.
Sleep physiology
Methodology
Before advances in the fields of neurology, neuroscience, electronics and genetics were made, scientists studied the behavioral characteristics of sleep, such as its pattern, depth, and varying frequency. In more recent times, the electrical impulses generated by the brain are recorded using a device called an electroencephalograph (EEG), and individual genes relating to sleep-related brain function, such as the circadian rhythm, have been isolated. Molecular biology, medical science and epidemiology all play an important role in modern studies of sleep. More on [ Sleep ]
Man I can't sleep. Maybe cuz I've been sleeping since 8pm? Anyway guna try and go back to sleep. Gott b up @ 6.
Amandassweetest (Cleo Amanda Gordon) Wed, 23 Dec 2009 11:52:11 -0000
Man I can't sleep. Maybe cuz I've been sleeping since 8pm? Anyway guna try and go back to sleep. Gott b up @ 6.
RT @kayeezzee: Sleeping(get ya ass up!!! Gud morning)
PurpleKissezXXX (Rated R) Wed, 23 Dec 2009 11:52:07 -0000
RT @kayeezzee: Sleeping(get ya ass up!!! Gud morning)
@lusciousvixen He is a bit of a sloth..nearly always horizontal or sleeping in the photo's. But mega cute
lucretialive (lucretia) Wed, 23 Dec 2009 11:52:06 -0000
@lusciousvixen He is a bit of a sloth..nearly always horizontal or sleeping in the photo's. But mega cute
Skin Care â Sleeping Beauty: Your skin repairs itself naturally during the night, so why not help it along the he... http://bit.ly/6MPlHd
greatlogix (greatlogix) Wed, 23 Dec 2009 11:52:03 -0000
Skin Care – Sleeping Beauty: Your skin repairs itself naturally during the night, so why not help it along the he... http://bit.ly/6MPlHd
at work til 2. I'd like to say i'm okay with this but i wish i was still sleeping. I think someone should text me. =)
JustTry2AmazeMe (Brittany Holtman) Wed, 23 Dec 2009 11:51:45 -0000
at work til 2. I'd like to say i'm okay with this but i wish i was still sleeping. I think someone should text me. =)
I hate not sleeping all night and then being forced out of bed in the morning :( x
Dollyy26 (Dolly Rae Croot) Wed, 23 Dec 2009 11:51:44 -0000
I hate not sleeping all night and then being forced out of bed in the morning :( x
Baby's Sake - Sells BabeSafe mattress covers and cotton sheets for baby crib mattresses.
Meta Description: [ SIDS prevention information ]
JR Safety Crib Sheets - Sheet safeguards babies by staying securely on the mattress using pillow case design.
Meta Description: [ JR Safety Crib Sheets maker of the StayPut(tm) Safety Crib Sheet. The original as seen on TV by Marie Reen. Pillowcase design with a flap that velcros under the mattress. Safeguards from dangers associated with fitted crib sheets. Parents sleep soundly knowing your baby sleeps safely. ]
Safe T Sleep - Featuring a designed wrap with the goal of keeping a baby sleeping in a comfortable and safe position.
Meta Description: [ SafeTSleep. Unique baby safety products that support positive parenting practices and helps to prevent injuries and deaths occurring in and around babies' sleep times. Baby Safety Products by SafeTSleep. SafeTSleep for all your Baby Safety Products ]
Snugtuck - Provides pillows that are designed to keep children from falling off the bed at night.
Meta Description: [ We sell top quality child safety pillows that keep children in bed: safe and simple. Better and easier to install than bed railings. ]
Stork to Chalk - New Zealand business offering a variety of items to protect babies.
Meta Description: [ Comprehensive range of quality products which make parenting babies-children safer & easier. Travel, sleep, feeding, safety, at home, pregnancy. ]
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