FACTOID #151: The five countries with the highest coffee consumption are also the five countries whose citizens trust one another the most. Coincidence? Probably.
Polysomnogram demonstrating SWS. High amplitude EEG is highlighted in red. Click on image for more information
Slow Wave Sleep (SWS) is a term used to describe stages 3 and 4 sleep. Image File history File links Download high resolution version (837x587, 235 KB) Summary This is a screen shot of a patient during Slow Wave Sleep (stage 4). ... Image File history File links Download high resolution version (837x587, 235 KB) Summary This is a screen shot of a patient during Slow Wave Sleep (stage 4). ... In an ideal situation, sleep should be undisturbed and experienced in the same room every night Sleep is the regular state of natural unconsciousness observed in all mammals, birds and fish. ...
Electroencephalographic Characteristics
Large 75 microvolt delta waves predominate the electroencephalogram. A delta wave is a large, slow brain wave associated with deep sleep. ... Electroencephalography is the neurophysiologic exploration of the electrical activity of the brain by the application of electrodes to the scalp. ...
Predominates the first third of the night.
Characteristics
SWS is often referred to as deep sleep. This is probably due to the often intense groggy feeling one gets when awoken from this stage. If deprived of sleep, there is a sharp rebound of SWS, suggesting a "need" for this stage. A rebound, in some sports, is the retrieval of the ball after a missed shot, especially in basketball and netball. ...
Long-lasting persistence of continuous spike waves during sleep is postulated to be responsible for the neuropsychiatric abnormalities in electrical status epilepticus during slowsleep.
Therefore, although electrical status epilepticus during slowsleep is currently classified among the epilepsies undetermined whether focal or generalized, consistent data support the view that this syndrome is to be included in the domain of localization-related epilepsies, of cryptogenic or symptomatic nature.
Sleep EEG performed at an early stage shows an increase of the aforementioned abnormalities without the features of the continuous spike waves during slowwavesleep (Tassinari et al 1985).
Sleep is not actually "unconsciousness," but rather, it is a natural state of rest characterized by a reduction in voluntary body movement, decreased awareness of the surroundings, an increased rate of anabolism (the synthesis of cell structures) and a decreased rate of catabolism (the breakdown of cell structures).
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.
Obstructive sleep apnea, a condition that is being diagnosed with increased frequency, may be classified either as a dyssomnia or as an example of a parasomnia.
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