Six drug-free depressed patients, each of whom acted as their own control, were studied for eleven consecutive days during which they were twice deprived of sleep for either 36 or 40 hours. The sequence of events was baseline (3 days), SD, recovery (3 days), SD, recovery (3 days). Blind ratings of clinical state were made on the basis of four-hourly interviews (standardized for each case), which were videotaped; sleep was monitored by conventional electrophysiological methods. Sleep deprivation had a beneficial, but transient, effect on four of the six patients studied. Changes in sleep were unrelated to changes in clinical state.
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