Figure 2.

Comparison between the distribution of number of periodic limb movements per hour of sleep (PLMS; first 8 hours shown) in normal control subjects and patients with rapid eye movement (REM) sleep behavior disorder (RBD) or restless legs syndrome (RLS). The results of the statistical analysis of the differences between RBD and RLS or controls is shown at the top of each histogram bar (P values; NS = not significant). All values are shown as mean and standard error (whiskers). NREM refers to non-rapid eye movement sleep.