The delirious states

Delirium, not induced by alcohol and other psychoactive substances (F05)

 * Definition
 * a qualitative change in conciousness (lucidity, not in the vigilance)
 * Symptoms
 * perceptual distortions: illusions, hallucinations, disorientation time and place
 * Reversal of sleep-wake cycle (symptoms often worse at night)
 * psychomotor and emotional disturbances
 * Treatment
 * mainly supportive measurements: quiet room, talking to family for reorientation, waiting it out...
 * In acute agitation: Restriction of limbs to the bed, highly potent antipsychotics (haloperidol)

Causes

 * extracerebral or cerebral: organic brain changes, after operation conditions, infections, dehydration, metabolic disturbances, injury, cancer, serious burns...

Links
https://icd.who.int/browse10/2019/en#/F95 (ICD-10 Classification)