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. 2022 May 1;18(5):1479–1482. doi: 10.5664/jcsm.9896

Figure 3. Nystagmus on REM stage sleep.

Figure 3

On PSG, EOG showing conjugate vertical sharp waves with frequency 3.5 Hz in REM stage in the second half of epoch. The waves are fast frequency-lower amplitude compared to the classic rapid eye movements of stage REM sleep seen in the first half of the epoch. EOG = electrooculogram, PSG = polysomnography, REM = rapid eye movement.