Figure 2.

Nocturnal rapid eye movement (REM) sleep latencies are shorter in narcolepsy with cataplexy (N+C). Patients with N+C have significantly shorter median polysomnography rapid eye movement (PSG REM) sleep latencies than patients with other hypersomnias or Other diagnoses. 54% of patients with N+C have a PSG REM sleep latency ≤ 15 min (dashed line). Each box represents the interquartile range, which contains 50% of values. Bars across the boxes represent median values in each group, and whiskers show minimum and maximum values excluding outliers (o) which are 1.5 standard deviations from either end of the box.