Sleep Theories - acid etc These theories were very poorly...

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Sleep Theories 1) Early theories The early theories focused on what produced sleep not what sleep does (the purpose of sleep). It was originally believed that sleep resulted from a build-up of some substance in the brain that occurred during wake which diminished with sleep. Aristotle actually had similar beliefs 2000 years earlier. Advances in Physiology resulted in a new perspective that sleep was caused by "congestion in the blood". Some said sleep was caused by blood building up in the brain. ..some said it was from blood draining from the brain. 2) Behavioral theorists During the 19th century scientists believed sleep was a result of lack of stimulation. ..remove stimulation, an organism goes to sleep. Also, it was believed that sleep was an active process of preventing fatigue - "we sleep not because we are intoxicated or exhausted, but to prevent from becoming intoxicated or exhausted." 3) 20th century The main ideas were substances accumulating in the brain like carbon dioxide, cholesterol, lactic
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Unformatted text preview: acid, etc. These theories were very poorly formulated and not well supported. 4) The Restorative (restoration) perspective belief that sleep is used to restore our bodies after wear and tare. Despite the lack of conclusive evidence or supporting data, this is still one of the most popular theories. 5) Non-Restorative Rather than sleep being restorative, this perspective is that sleep is instinctive. Sleep is an "evolutionary leftover". During the days of being hunters, and trying to avoid being the hunted, we needed to be as invisible and quite as possible during the night hours (since we are not nocturnal, we are more easily caught and eaten during those times). As a result, we developed REM sleep so that we can be immobile and silent during the night (remember that we are paralyzed during REM). We are immobile during non-productive hours which can serve to protect us from danger, prevent waste of energy, etc....
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