Lecture 6.docx - Stages of Sleep-Brain waves are co-ordinated activity by the nervous system in which large numbers of neurons fire together-Brain waves

Lecture 6.docx - Stages of Sleep-Brain waves are...

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Stages of Sleep -Brain waves are co-ordinated activity by the nervous system in which large numbers of neurons fire together -Brain waves are typically measured by an Electroencephalogram (EEG) machine. -Waking brain waves are called beta waves, and are short and irregular. -In the first stage of sleep (NREM1) people start to feel relaxed and the brain waves get slightly larger. -After about 10 minutes, the brain enters the second stage of sleep (NREM2) -Brain waves get slower (called theta waves) -Sleep spindles (short high frequency bursts of activity) appear in stage 2 and are thought to reduce the brain’s sensitivity input. -People awakened in stage 2 often deny they have been sleeping -Stage 3 (NREM3) begins about 15 min after stage 2 and is the deepest sleep. -Brain waves are slowest (called delta waves) -People awakened in stage 3 are very groggy. -Night terrors most frequently occur in stage 3 and tent to be non-narrative. -REM (rapid eye movement) sleep begins about 45 minutes after stage 3 -Brain waves look like stage 1 waves -The body is paralyzed by the Pons and the muscles relax.
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