What are the two main types of sleep mentioned in the passage?
ALight sleep and deep sleep
BREM sleep and non-REM sleep
CDreaming sleep and non-dreaming sleep
DStage 1 sleep and Stage 3 sleep
ALight sleep and deep sleep
BREM sleep and non-REM sleep
CDreaming sleep and non-dreaming sleep
DStage 1 sleep and Stage 3 sleep
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