RLS movement occurs prior to and in early stages of sleep, whereas in RBD, PLMD, and
sleepwalking disorder, motor activity is limited to sleep.
(31) Approximately 2.5 percent of the general population suffers from sleepwalking disorder. (32) More specifically, only 0.5-0.7 percent of adults experience weekly to monthly episodes of sleepwalking.
According to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition ("DSM-IV") the diagnostic criteria for sleepwalking disorder includes "repeated incidents of complex motor behavior initiated during sleep ..." (79) Accordingly, investigators should explore whether the suspect has a prior history of sleepwalking or if the first time happened to involve the sexual abuse of a child.