STATES OF CONSCIOUSNESS
PSYCHOLOGY OF SLEEP
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The sleep cycle repeats itself every 60 minutes.
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During REM sleep the muscles are tense and brain waves reveal deep relaxation
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As sleep progresses, NREM-3 sleep diminishes while REM sleep increases.
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Most of a night’s sleep is spent in REM.
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Detailed explanation-1: -Which of the following is most accurate about a typical night’s sleep? As sleep progresses, NREM-3 sleep diminishes while REM sleep increases.
Detailed explanation-2: -What happens to NREM-3 sleep as the night goes on? Gets briefer then disappears. How much of an average night’s sleep do we spend in REM? 20-25% of night’s sleep.
Detailed explanation-3: -Both types of sleep are important. While experts used to believe REM sleep played the most important role in learning and memory processes, they now consider NREM sleep even more important for these functions. Plus, the most restful phase of sleep also happens during NREM sleep.
Detailed explanation-4: -In normal adults, REM sleep increases as the night progresses and is longest in the last one-third of the sleep episode. As the sleep episode progresses, stage 2 begins to account for the majority of NREM sleep, and stages 3 and 4 may sometimes altogether disappear.
Detailed explanation-5: -Approximately 75% of sleep is spent in the NREM stages, with the majority spent in the N2 stage.[14] A typical night’s sleep consists of 4 to 5 sleep cycles, with the progression of sleep stages in the following order: N1, N2, N3, N2, REM.[15] A complete sleep cycle takes roughly 90 to 110 minutes.