PSY 2510 Chapter Notes - Chapter 15: Rapid Eye Movement Sleep, Theta Wave, Delta Wave
21 Apr 2020
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Within the dream, different phases are distinguished that are identified by the existence or not of a rapid rem (rapid eye movement) eye movement, which is visible under the eyelid to the observer. This stage lasts a few minutes: stage 2 appears after one and represents more than 50% of sleep time. It is characterized by electroencephalographic waves with a higher frequency than the theta. Muscle tone becomes somewhat weaker and the awakening threshold is raised. It corresponds to the beginning of the dream itself: stages 3 and 4 correspond to the deepest sleep because during them delta waves appear, which are very slow. Muscle tone is weak and heart rate and respiratory rate decrease. During them dreams occur, as well as episodes of night terror in the child and sleepwalking episodes. The eye movements, if they exist, are slow. After going through these stages, for about 70 to 120 minutes, the first rem phase (rapid eye.
