Answer: sleepwalker

AnswerCrossword Clue
SLEEPWALKERLady Macbeth's famous role.
SLEEPWALKERClint at 3:00 A.M.?
SLEEPWALKERLady Macbeth, on occasion
SLEEPWALKERNocturnal wanderer
sleepwalkerone who sleepwalks