Biological rhythms RESEARCH

1. Reviewed 50 studies of sleep deprivation,very few showed serious effects (5)
4. Shift work: chemical plant in utah that caused sleep problems in the workers. Adjusted the shift pattern to compliment natural rhythms over a three week rotation, productivity and health increased (8, 2, 2)
5. Shift work: philadelphia police dept, 1/2 had sleeping problems, 1/4 had accidents, adjusted the pattern and accidents and sleep problems decreased (8)
6. Function of sleep: protection from harm! (6)
9. Infradian rhythms: studied 600 girls, more likely to have their first period in the winter (8)
10. Infradian rhythms: woman spent 3 months in a cave, her cycle shortened to 25.7 days and took 18 months to return to normal (8)

2. Deprived rats of sleep for 4 weeks, lost weight, temp became unstable, thyroid gland failed, immune failure, all died by 4 weeks (13)
3. Jet lag: supports schwartz, analysis of baseball teams, east to west teams won 44% of games, west to east won 37% (4, 2, 2)
7. Wakeathon case study: 201 hours, 8 and a half days without sleep, negative consequences such as hallucinations and paranoia. (5, 5)
8. Insomnia: longitudinal study, 1000 children from birth, a correlation between family conflict (9-18) and insomnia (7)

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