Diuranal Rhythms in 2- and 8-Week-Old Infants: Sleep-Waking State Organization as a Function of Age and Stress

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Abstract
Time of day differences in sleep-waking state organization were studied in 2- and 8-week-old infants by means of videotape recordings. Observations were made prior to and following adaptation to standard laboratory conditions previously found to be stressful. Diurnal rhythms occurred for a number of component sleep-waking states under the nonstressful conditions only, and increased with age.

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