PSY100H1 Chapter Notes - Chapter 11: Adenosine, Hypnopompic, Cataplexy

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25 Jan 2013
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PSY100H1 Full Course Notes
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Circadian rhythm: our daily cycle of sleep and waking (a cycle of 24 hours) Zeitgeber: external stimuli or cue for setting biological rhythms (light, etc) Light, physical activity, feeding, body temperature & sleep-related hormones. Internal biological clock + zeitgeber = circadian rhythm. Light helps us fo on the 24 hr clock in accordance w/ earth"s rotation. Larks (morning person) vs. owls (night person) During adolescence, we all become temporary night owls ==> could be due to a drop in melatonin during puberty. Shift work, jet lag, and daylight saving time. 1. 5 less hrs of sleep than normal pple. Phase delay (fall) is easier than phase advance. Jet lag is worse when travelling east (you have to sleep earlier and get up earlier than you normally would) Body"s master clock ==> suprachiasmatic nucleus (scn) in the hypothalamus (located above optic chiasm) Only active during the day (despite whether it"s a night or morning animal) Helps animals distinguish btwn day and night.

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