bístou, n. Controlling dream; supposed as a cause of sleepwalking or other parasomniac behaviour. Because of Ksreskézaian belief, the Lilitai hold a long-standing superstition that this constitutes a form of possession by Ighokhéa (or Múrekíha, if violent) and individuals suffering from bístoai were usually appointed an attendant to wake them up (called bístogalsu), making them characteristically underslept.