PSYB64H3 Study Guide - Non-Rapid Eye Movement Sleep, Circadian Rhythm, Suprachiasmatic Nucleus
9 Aug 2013
School
Department
Course
Professor
Document Summary
Biological cycles can vary in length: sleep-wakefulness cycle, about 24 hours, the human menstrual cycle, about a month, sad (seasonal affective disorder) Ultradian = rhythms shorter than 24 hours. Zeitgebers: any external cue that synchronizes an organism"s internal clock. Variations in sleep patterns: night owls versus larks. Melatonin drops at onset of puberty; younger people tend to favour being an owl; change as we age. Shift work, jet lag, and daylight saving time: shift maladaptation syndrome, easier to adjust to a phase-delay than a phase-advance. Shift work, jet lag, and daylight saving time: shift maladaptation syndrome: http://www. youtube. com/watch?v=qcwjlim91vm&feature=channel, easier to adjust to a phase-delay than a phase-advance. Daylight saving time in spring requires a phase advance, and can produce symptoms similar to jet lag. The time change in fall is equivalent to a phase delay, and causes little disruption for most people. Jet lag is worse when traveling east (figure 11. 3) Traveling eastward is more disruptive than traveling westward.
