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Abstract The quantity and quality of sleep have been measured objectively in 4 patients before and after open heart surgery; 2 of these became delirious on the third postoperative day. A fifth patient was studied in relation to major abdominal surgery. The degree of sleep disturbance in the early postoperative period was greater after cardiac than abdominal surgery but was not consistently related to the ensuing delirium. Although patients were woken frequently by the necessity for nursing and other care, they were unable to remain asleep when left undisturbed during the period of delirium, which lasted for several days. Rapid eye movement (REM) sleep was absent and delta wave sleep markedly reduced after cardiac surgery and with delirium although the patients described frequent ‘dream-like’ experiences in their drowsy state. Delirium after cardiac surgery difsers from that which sometimes occurs after withdrawal of addictive drugs, when a high proportion of REM sleep is observed.
Johns et al. (Wed,) studied this question.