An article collection in Sleep Science and Practice aims to present in detail the most recent advances in the clinical and semiological features description of sleep-related epileptic and non-epileptic motor behaviors emphasizing the crucial role of video-polysomnography for their differential diagnosis.

​​​​​​​The spectrum of complex motor behaviors that can occur during sleep is wide. These phenomena include epileptic seizures and parasomnias both from non-rapid eye movement (NREM) such as  disorders of arousal (DOA) and from rapid eye movement (REM) sleep such as REM sleep behavior disorders (RBD).