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Purpose of Sleep - IV Purpose of Sleep A Evolutionary...

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Article I. IV. Purpose of Sleep A. Evolutionary perspective: sleep for practical reason 1. Evolved to keep us quiet at night: keeps us out of the way of predators B. Sleep deprivation: 1. Abruptly reduce the amount of sleep a person is allowed to have a) Irritability, fatigue, lapses in attention, generally speaking mentally inefficient, less sociable, not a lot of physical consequences “hat band” pressure b) Typical reaction: fall asleep quicker the next night 2. Gradual reduction over a two month period a) No detectable effects over the short run 3. No sleep a) Similar problems as sleep deprivation b) Rare occasion of hallucinations C. REM deprivation: participants come into sleep lab, are allowed to sleep but are awakened during REM 1. 2 hours 2. REM rebound D. What exactly does REM sleep do for us? 1. Important for learning consolidation: consolidating what you have learned during the day into memory 2. Ach: when we REM, there is activity in the brain. Idea here is that Ach activity is the mechanism by which REM sleep allows us to consolidate what you have learned during the day into memory.
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