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psy2_lec15_sleep - Sleep is good for your brain Circadian...

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Sleep… …is good for your brain
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Circadian rhythm square6 The body’s “clock” square6 The suprachiasmatic nucleus boxshadowdwn In the hypothalamus boxshadowdwn Monitors light levels (input from optic nerves) boxshadowdwn Daily cycles: body temperature, hormones, metabolism boxshadowdwn Individual need for sleep appears to be genetic boxshadowdwn The circadian rhythm often involves a “nap” period square6 Naps boost reaction time and alertness
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Sleep stages square6 Four stages of sleep square6 Sleep stages during the night, and EEG patterns:
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Sleep stages square6 EEG
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Sleep stages square6 Stage 1 boxshadowdwn Falling asleep: not encoded in memory square6 Takes about 1 second: brain waves change square6 REM sleep square6 Stage 2 boxshadowdwn Sleep spindles – bursts of brain activity square6 Stages 3 and 4 boxshadowdwn Slow-wave sleep: Delta waves boxshadowdwn Deep rest: blood pressure low, metabolism slow
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Sleep stages square6 REM sleep boxshadowdwn “Rapid Eye Movement” boxshadowdwn
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