What percentage of sleep is NREM?

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Multiple Choice

What percentage of sleep is NREM?

Explanation:
Sleep is organized into cycles that involve NREM and REM stages, with NREM forming the larger portion of the night. On average, about three-quarters of sleep is NREM, while REM accounts for about one-quarter. Across a typical night, you go through several ~90-minute cycles; early cycles contain more deep NREM sleep, and REM episodes lengthen toward morning, but REM never dominates the night. That’s why the correct answer is three-quarters. If you consider the other possibilities, they don’t fit the typical distribution: one-quarter would imply mostly REM, half would be an even split, and all sleep being NREM ignores the presence of REM in the cycle pattern.

Sleep is organized into cycles that involve NREM and REM stages, with NREM forming the larger portion of the night. On average, about three-quarters of sleep is NREM, while REM accounts for about one-quarter. Across a typical night, you go through several ~90-minute cycles; early cycles contain more deep NREM sleep, and REM episodes lengthen toward morning, but REM never dominates the night. That’s why the correct answer is three-quarters. If you consider the other possibilities, they don’t fit the typical distribution: one-quarter would imply mostly REM, half would be an even split, and all sleep being NREM ignores the presence of REM in the cycle pattern.

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