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A Comparison Between 2- to 3-Year-Old and 4- to 6-Year-Old Children

Edwin Kahn, PhD; Charles Fisher, MD; Adele Edwards; David M. Davis

Arch Gen Psychiatry. 1973;29(3):380-385.

Abstract
When all sleep, including naps, for a 24-hour period for 2-year-olds was compared with the nocturnal sleep of 5-year-olds (who do not nap), it was found that the minutes and percentages of stage 4 and the percentages of rapid eye movement (REM) sleep were very similar.

Previous investigators had reported a striking reduction in REM sleep and increase in stage 4 between ages 2 and 5 but they had not included nap time in their computations.

Author Affiliations
New York

From the Department of Psychiatry, Mount Sinai School of Medicine of the City University of New York.

Footnotes
Accepted for publication Jan 13, 1973.

Reprint requests to the Sleep Laboratory, Department of Psychiatry, Mount Sinai School of Medicine, the City University of New York, Fifth Ave and 100th St, New York, NY 10029 (Dr. Kahn).

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