Delirium

Delirium is a specific state of acute confusion attributable to the direct physiological consequence of a medical condition, the effects of a psychoactive substance, or multiple causes, which usually develops over the course of hours to days. As a syndrome, it presents with disturbances in attention, awareness, and higher-order cognition. People with delirium may also experience other neuropsychiatric disturbances, including changes in psychomotor activity, a disrupted sleep-wake cycle, emotional disturbances, and perceptual disturbances, although these features are not required for diagnosis.