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. 2021 Apr 1;17(4):719–727. doi: 10.5664/jcsm.9056

Figure 1. An episode of sleep paralysis.

Figure 1

An episode of sleep paralysis signaled by the left–right–left–right (LRLR ocular coding, vertical arrow) horizontal eye movements (the same code is often used to signal lucid dreaming in lucid dreamers), with clear theta rhythms on the EEG, as shown here in a 30-second epoch of polysomnography. From top to bottom, EEG (Fp1/A2, C3/A2, and C3/O1 channels with their filters and amplitudes), electro-oculography (EOG 1: right superior canthus/A2; EOG2: left inferior canthus/A2) and electromyography (EMG1). Green vertical lines rule every second of clock time. EEG = electroencephalography, REM = rapid eye movement.