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In the article "Psychological Differences Between Long and Short Sleepers," by Ernest Hartmann, MD, Frederick Baekeland, MD, and George R. Zwilling, published in the May issue (26:463-468, 1972), several words important to the meaning of the text were inadvertently omitted by the printer.Paragraph 4, column 1, page 468, should read as follows:Our laboratory studies demonstrated that the long and short sleepers spend equal amounts of time in SWS (stages 3 and 4), while the long sleepers have twice as much D-time.6,7 (Long sleepers also have more stage 2; however, at present there is considerable evidence of a "need for D" but very little such evidence for stage 2 which seems a milder form of SWS.) This suggests an interpretation that requires further research and argument: that if indeed sleep requirement is increased in certain persons characterized by worry, stress,
CORRECTION. Arch Gen Psychiatry. 1972;27(6):815. doi:10.1001/archpsyc.1972.01750300077014