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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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- Spring '10