DELIRIUM
Definitions of 'Delirium' include:
Delirium is a state of mental confusion that develops quickly and
usually fluctuates in intensity. Delirium is a syndrome, or group of
symptoms, caused by a disturbance in the normal functioning of the
brain. The delirious patient has a reduced awareness of and
responsiveness to the environment, which may be manifested as
disorientation, incoherence, and memory disturbance. Delirium is
often marked by hallucinations, delusions, and a dream-like state.
Delirium may result from ingestion of legal or illegal psychoactive
drugs, including....opiates, including heroin and morphine). A
delusion is an unshakable belief in something untrue. These
irrational beliefs defy normal reasoning, and remain firm even when
overwhelming proof is presented to dispute them. Delusions are often
accompanied by hallucinations and/or feelings of paranoia, which act
to strengthen confidence in the delusion. Delusions are distinct
from culturally or religiously based beliefs that may be seen as
untrue by outsiders."
(ref
http://www.answers.com/topic/delirium?cat=health)