PSYC 1121 Lecture Notes - Lecture 9: Pineal Gland, Amygdala, Circadian Rhythm
Document Summary
Lecture 24: falling asleep and the experience of sleep. Most of sleep (75%) is spent in non-rem sleep. It is quiet during non-rem and rem sleep. A type of paralysis occurs during rem sleep. Alcohol induces sleep but affects rem sleep (reduces the quality of sleep). Non-rem stage 1: back and forth between wake/sleep; easy to wake; muscle activity; beta/alpha eeg patterns. Non-rem stage 2: deeper sleep, harder to wake, muscles more relaxed, theta eeg, sleep spindles, less alpha. Non-rem stage 3 and 4 (slow wave sleep): much harder to wake, muscles relaxed, lower oxygen consumption, delta eeg. Rem (paradoxical sleep): ignores outside world, eeg is much like awake in certain brain areas, higher levels of oxygen than awake, physio-homeostasis breaks down. E. g. food, drugs, temperature, stress, social factors, changes in illumination. Neurons work on a timer , becoming active every 12 hours and releasing neurotransmitters for sleep or wake. There is a periodic nature of sleep.
