PSYC 1001 Lecture Notes - Lecture 4: Circadian Rhythm, Night Terror, Jet Lag
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PSYC 1001 Full Course Notes
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Monday february 1, 2016; class six (cid:862)body rhyth(cid:373)s a(cid:374)d me(cid:374)tal pace(cid:863) Human circadian rhythm is approximately 24 hours and easily adapted to external cues. During the dark hours melatonin is secreted and light causes melatonin to fall. Suprachiasmatic nucleus (hypothalamus) responds to light and darkness. The scn regulates the pineal gland"s secretion of melatonin at night. When our normal routine changes, circadian rhythms may be thrown off. Hypnagogic stage dreamy, as you"re falling asleep. Stage 1 sleep: ~10 minutes; hallucinatory occurrences, drowsy feelings, sudden muscle jerks, light sleep (easily awoken) Stage 2: k-complex response to external stimuli, usually sounds (grunts, incorporation into dreams) Stage 4: 30 minutes; deepest level of sleep, slowest stage, least likely to wake up. Second rem: after cycling through the stages again; longer than the first rem. The deepest sleep you"ll have is in the first two to three hours of sleep.
