Quote from Reese in Hal Sleepwalks
Reese: I'm willing to forget I ever saw this, if you tell me everything you know about sleepwalking. Malcolm: Sleepwalking? Well, all I know is it's a dissociative state, which basically is... Reese: Just tell me what causes it. Malcolm: Well, there's a few things. It usually happens when a person is under intense, emotional or psychological stress. Reese: So, if a sleepwalker stays stressed out, he'll continue sleepwalking? Malcolm: I don't know, probably. Reese: Beautiful.