The person may seem 'out of it ' or not able to understand what's going on. The fluctuations can happen over a minute, hour, or day. The fluctuations begin very quickly - they do not build up over time. Often, the symptoms are the worst in the evening or night when there are less people around and less things going on. Delirium usually lasts a few hours or a few days, depending on the person, the cause of delirium, and how quickly they are treated.
Most patients recover completely.
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