"Sleep-Wake Function and Personality Patterns in Chronic Insomniacs and Healthy Controls."

A comparison was made between 16 middle-aged chronic insomniacs and 16 normal sleepers, matched by age and sex, in a psychophysiological study, including polysomnographic night sleep recordings, MMPI personality profiles, testing of cognitive performance, and relaxation capability during daytime.

Both objective and subjective criteria of night sleep demonstrated a clear separation of the two groups. Insomniacs had psychosomatic personality profiles.

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