REM and your brain
During REM sleep, brain wave activity increase, as measured on an electroencephalogram (EEG).
- N1 sleep shows slowing of the normal alpha wave pattern noted during the awake state.
- N2 sleep introduces K waves - long, high voltage waves - lasting up to 1 second, and sleep spindles - periods of low voltage and high-frequency spikes.
- N3 sleep is characterized by delta waves, or high voltage, slow and irregular activity.
- During REM sleep, sleep patterns show low voltage and fast waves, some alpha waves, and muscle twitch spikes associated with transmitted rapid eye movement.
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Specific frequencies are thought to be involved in specific cognitive tasks.
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