Restless Sleep Disorder.

Restless sleep disorder is (RSD) a condition characterized by frequent large movements during sleep associated with daytime impairment. RSD has been studied in children aged 6 to 18 years. Polysomnography is necessary for the diagnosis of RSD. The current diagnostic criteria include more than 5 large movements per hour of sleep documented by PSG. The pathophysiology is not known yet, but iron deficiency and sleep instability and increased sympathetic activation are suspected to play a role. Iron supplementation is the only treatment option studied so far.