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 s The body’s “clock” s The suprachiasmatic nucleus b In the hypothalamus b Monitors light levels (input from optic nerves) b Daily cycles: body temperature, hormones, metabolism b Individual need for sleep appears to be genetic b The circadian rhythm often involves a “nap” period s Naps boost reaction time and alertness
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Sleep stages s Four stages of sleep s Sleep stages during the night, and EEG patterns:
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Sleep stages s EEG
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Sleep stages s Stage 1 b Falling asleep: not encoded in memory s Takes about 1 second: brain waves change s REM sleep s Stage 2 b Sleep spindles – bursts of brain activity s Stages 3 and 4 b Slow-wave sleep: Delta waves b Deep rest: blood pressure low, metabolism slow
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Sleep stages s REM sleep b “Rapid Eye Movement” b “Paradoxical sleep” s Sleep paralysis: brain stem blocks motor signals; body deeply relaxed s Yet brain very active; heart rate, breathing, temperature fluctuate rapidly b Dreaming – sensory cortex areas are active b Lucid dreaming s Asleep, but self-aware
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This note was uploaded on 04/02/2010 for the course PSYCH 2 taught by Professor Don'tremember during the Spring '04 term at University of California, Berkeley.

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

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