Reported sleep characteristics: effects of age, sleep length and psychiatric impairment.

Abstract One hundred and five long (9 hours or more) and short (6 hours or less) sleepers, age 20–49 and free of drugs and internal medical problems, filled out the Cornell Index and the Rotter Incomplete Sentences Test and kept daily records of their sleep times and dream recall for 14 consecutive days. Eighty-four Ss also kept a more extensive sleep and dream log for 14 consecutive days. Psychiatric impairment was associated with more variable sleep, presleep tension, difficulty falling asleep and a light restless, unrefreshing sleep punctuated by awakenings, as well as more frequent dream reporting in younger long sleepers. Older Ss reported sleep which was less variable and lighter. Short sleepers had more variable sleep, while long sleepers gave more dream reports.

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