During REM sleep, which of the following describes the EEG and EMG characteristics and eye movements?

During REM sleep, which of the following describes the EEG and EMG characteristics and eye movements?

• A. Dream sleep with EEG low voltage, high frequency, low EMG; eyes move rapidly
• B. Delta waves predominate; high EMG; no eye movement
• C. Beta activity with high EMG and no dreaming
• D. Theta waves with moderate EMG and no eye movement

Answer: (B)

REM sleep shows desynchronized, low-amplitude, mixed-frequency EEG activity similar to wakefulness, paired with near-total loss of muscle tone (very low EMG) and rapid eye movements. This combination—awake-like brain activity with active eyes but minimal body movement—defines REM sleep and aligns with the experience of dreaming. Delta waves indicate deep non-REM sleep (N3), where muscle tone is preserved and no rapid eye movements occur. Theta activity with moderate EMG and no eye movements fits lighter non-REM stages (N1/N2), which lack the rapid ocular activity of REM. Beta activity with high EMG and no dreaming describes an awake or highly aroused state, not sleep.

REM sleep shows desynchronized, low-amplitude, mixed-frequency EEG activity similar to wakefulness, paired with near-total loss of muscle tone (very low EMG) and rapid eye movements. This combination—awake-like brain activity with active eyes but minimal body movement—defines REM sleep and aligns with the experience of dreaming.

Delta waves indicate deep non-REM sleep (N3), where muscle tone is preserved and no rapid eye movements occur. Theta activity with moderate EMG and no eye movements fits lighter non-REM stages (N1/N2), which lack the rapid ocular activity of REM. Beta activity with high EMG and no dreaming describes an awake or highly aroused state, not sleep.