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Title: During the night, which two types of sleep alternate with each other in cycles that take approximate Post by: SpiderX on Feb 1, 2015 During the night, which two types of sleep alternate with each other in cycles that take approximately 90 minutes?
a. alpha sleep and delta sleep b. Stage 1 and Stage 2 sleep c. REM and NREM sleep d. relaxed sleep and alert sleep Title: Re: During the night, which two types of sleep alternate with each other in cycles that take approxi Post by: Nelly on Feb 7, 2015 Content hidden
Title: Re: During the night, which two types of sleep alternate with each other in cycles that take approximate Post by: SpiderX on Feb 9, 2015 Love psychology, thanks for the lead. Your answer came out right :D
Title: Re: During the night, which two types of sleep alternate with each other in cycles that take approximate Post by: Nelly on Feb 10, 2015 Great news! Thumbs up are welcome ;)
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