PS262 Lecture Notes - Lecture 9: Autonomic Nervous System, Brainstem, Suprachiasmatic Nucleus
Document Summary
Sleep, dreaming and citcadian rhythms: we spend about 1/3 of our lives sleeping 200 hours/yr, we need it for recuperation, being awake interupts homeostasis. Stages of sleep: emg measure muscles, eog monitors eye movements, eeg moniters electric potencials on scalp. Stage 2 frequency decreases and amplitude increases and k complexes happen (high amp waves) and sleep spindles. Circadian sleep cycles: variables that entrain them are called zeitgebers - enviromental cues light and dark but even when removed still have internal biological clock of 25 hrs. Jet lag: flying east advance flying west they are delayed, or every hour you need one day to get your rhythm in sync with zie in your new time zone. Its easier to lengethen schedule than shorten them. Simple tasks are disturbed but not high level cognitive ones: microsleeps are breif period of sleep sitting or standing. Subjects spend less time sleeping after long periods of wakefulness.
