<prompt> True about delirium is all Except:Preserved attentionDisturbed sleepDisorientationHallucination  <response>: Delirium Disturbance of consciousness with reduced ability to focus, sustain, or shift attention. perceptual disturbance, impaired cognition memory deficit, disorientation develops over a sho period of time usually hours to days and tends to fluctuate. Above disturbance develops as a consequence of medical condition, substance intoxication withdrawal Reference: P.324p.325 10.2 DeliriumKaplan Sadocks Comprehensive Textbook of Psychiatry, 9th Ed 