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There are three functional states of the brain. During a normal day, the brain will experience one state of awake and two states of sleep. The two states of sleep are REM (rapid eye movement) sleep and non-REM (non-rapid eye movement) sleep.

From the choices below, choose ALL that are characteristics of REM sleep.


Loss of muscle tone.


Alternating delta and beta activities.


Occasional twitching.


Rapid eye movement.

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