Delirium is characterized as hyperactive, hypoactive, or mixed. In hyperactive delirium, patients display “high energy” symptoms such as agitation, anger, hallucinations, and rapid speech. They may also become combative. Hypoactive delirium is characterized by “low energy” symptoms like sluggishness, slow speech, drowsiness, or seeming “out of it.” In mixed delirium, symptoms of both hyper- and hypoactive delirium are present and the patient may cycle between them.