(A) About 15 minutes during the night.
(B) About every 30 minutes in each 90 minute cycle.
(C) More often in NREM sleep than in REM sleep.
(D) About 90 minute a night.
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(A) About 15 minutes during the night.
(B) About every 30 minutes in each 90 minute cycle.
(C) More often in NREM sleep than in REM sleep.
(D) About 90 minute a night.