PSYC 2280 Lecture Notes - Lecture 11: Sleep Deprivation, Circadian Rhythm, Jet Lag
18 Dec 2013
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Document Summary
Circadian rhythm and disruptions: approximate 24 hour cycle, sleep in response to light/dark cues, melatonin production. Involves nuclei in the hypothalamus, hippocampus, and brain stem. Jet lag easier to shift forwards than to shift backwards. Restorative theory: sleep to restore homeostasis, stage 4 sleep does appear to serve some restorative function, possible immune functioning. Memory effects: memory consolidation, decreased working memory, research shows complex effects of different sleep stages on memory acquisition and consolidation. Decreased vigilance (ex. telling difference between tones) 2-3 days of deprivation: microsleeps (2-3 seconds long) remain sitting/standing, longer deprivation research is inconsistent. Some people affected quite a bit others very little (other than sleepy) **we lose the neurons that allow us to detect phonetic. Following sleep disruption, stage 4 sleep is almost entirely recovered. Waking people during slow wave sleep has major effects on feeling rested. Understanding sleep independently of stress, circadian disruptions, and light exposure is challenging. Gad sleep is not the primary criteria.
