PSYC 370 Lecture Notes - Lecture 19: Slow-Wave Sleep, Rapid Eye Movement Sleep, Electrophysiology
8 Jul 2019
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When he talks about it being a 90 min cycle: the profiles of those cycles change throughout the night. There is typically no rem happening in first bout of stage 1. Notice the duration of rem sleep changes across the night. Most dreaming occurs just before you wake up. Across the night, rem sleep periods get longer and how deep the individual is sleeping gets more shallow. Slow wave sleep = 3+4 , more similar than diff so no point to separate them. The different stages are characterized by their electrophysiological signal. This is done by wiring people up eeg! Beta-waves: if person is awake low-amplitude, high frequency waves. Just before falling asleep: you feel like you"re floating: burst of alpha waves still pretty high frequency 12-14 spikes / second but higher amplitude than the beta waves. If we could keep our eyes permanently fixed, we would go functionally blind.
