Fifty five (33 male and 22 female)had no recollection
of how long they slept. The mean duration of sleep and
the range stated by those who could estimate the length
of time slept are shown on Table 6. Objective assessment
of the duration of sleep was made by the nursing staff;
the mean duration was six and a half hours/24 hours for
males and six hours/24 hours for females. (Range 1 to 9
hours/24 hours for all patients.)