Hypnagogic foot tremor on polysomnography

This figure shows a 30-second epoch of a PSG with hypnogogic foot tremor. The PSG shows a series of EMG bursts in the leg channels that are 250 to 1000 milliseconds long with frequencies between 0.3 Hz and 4.0 Hz (dashed box), and the EEG shows drowsiness or sleep patterns consistent with stage N1.