Delirium is a complex problem, has a poorly understood pathophysiology, and usually manifests as a fluctuating disturbance of consciousness and cognition that develops over a short period and is associated with physical or mental illness.1 Delirium is not exclusively a complication of critical illness but develops in approximately one-third of patients treated in intensive care units (ICUs).2 The majority of these patients experience hypoactive delirium, a quietly confused state, rather than the more notable cases of agitated delirium, which present as overt hallucinations and hyperactivity.3