In sleep staging, the letter 'R' denotes which sleep stage?

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Multiple Choice

In sleep staging, the letter 'R' denotes which sleep stage?

Explanation:
R stands for REM sleep, the stage where rapid eye movements occur and muscle tone is greatly reduced while brain activity is relatively active, showing low-amplitude, mixed-frequency EEG similar to wakefulness. This combination—eye movements with atonia and a wake-like EEG—distinguishes REM from non-REM stages (N1, N2, N3) and from wakefulness. REM is the period when dreaming is most common, and the label uses the initial of Rapid Eye Movement to mark this unique stage.

R stands for REM sleep, the stage where rapid eye movements occur and muscle tone is greatly reduced while brain activity is relatively active, showing low-amplitude, mixed-frequency EEG similar to wakefulness. This combination—eye movements with atonia and a wake-like EEG—distinguishes REM from non-REM stages (N1, N2, N3) and from wakefulness. REM is the period when dreaming is most common, and the label uses the initial of Rapid Eye Movement to mark this unique stage.

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