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circadian rhythm

circadian rhythm. internal timing mechanism cycle of activity ~ 24 hours. suprachiasmatic nucleus. SCN of hypothalamus > pineal gland (melatonin). suprachiasmatic nucleus. entrainment & SCN. What does it mean to “entrain” the SCN?. What cues can entrain the SCN?. jet lag.

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circadian rhythm

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  1. circadian rhythm • internal timing mechanism • cycle of activity • ~ 24 hours

  2. suprachiasmatic nucleus SCN of hypothalamus > pineal gland (melatonin)

  3. suprachiasmatic nucleus

  4. entrainment & SCN What does it mean to “entrain” the SCN? What cues can entrain the SCN?

  5. jet lag • fatigue & inefficiency • body clock out of phase with timing of your surroundings phase-advance phase-delay

  6. why sleep? • body restoration • strengthens learning & • memory • evolutionary adaptation

  7. evolutionary adaptation • prevent injury in dark • energy conservation • predation & meal frequency

  8. evolutionary adaptation gorillas bears lions grazing animals

  9. EEG vs. EOG electroencephalograph vs. electro-oculograph

  10. awake relaxed wakefulness stage 1 stage 2 stage 3 slow wave sleep stage 4 slow wave sleep • rapid eye movement • resembles wakefulness REM • irregular activity • paralysis (pons)

  11. overnight REM slow wave sleep

  12. awake stage 1 stage 2 stage 3 stage 4 • sleepwalking • sleeptalking • night terrors REM • paralysis • dreams w/ plot

  13. sleep disorders

  14. insomnia 3 types: - hard to fall asleep - wake too early - wake frequently overnight

  15. insomnia Restless Leg Syndrome

  16. bruxism Do you ever clench or grind your teeth at night?

  17. discussion As a child, ever wake up screaming? Difference between night terror & nightmare?

  18. sleeping pills benzodiazepines “Ambien”

  19. discussion “Ambien Drivers” Should a person be accountable for their behavior?

  20. other Heard stories of a guy attacking someone in his sleep? REM Sleep Behavior Disorder (violence?)

  21. discussion Difference between sleepwalking & REM Sleep Behavior Disorder?

  22. discussion When you awaken, you are paralyzed. You can hear, feel, think but can’t move!

  23. narcolepsy a broad category

  24. narcolepsy sudden attacks of extreme, irresistible sleepiness midday

  25. sleep paralysis When you awaken, you are paralyzed. You can hear, feel, think but can’t move!

  26. hallucinations • hypnopompic • hypnogogic

  27. cataplexy loss of muscle control during high emotion

  28. dreams ACTIVATION SYNTHESIS THEORY • environmental stimuli • random pons firing activates brain • issues preoccupied with • cortical areas try to make sense of • random info • frontal lobe is shut down so no logic

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