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Arch Gen Psychiatry. 1972;27(6):815.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Altered Meaning.—

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, . . . [Full Text PDF of this Article]