Development of sleep in infancy.

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Abstract
Seven children were repeatedly observed, up to 6 mo. of age, during nighttime and afternoon sessions. Using criteria of respiration, ocular reactions, motor activity, vocalization, hand movements with toys and eeg, the state of quiet sleep, the state of active sleep, and the waking state have been distinguished. Quiet sleep (regular breathing with frequency of 30/min., closed eyes without movements, disappearance of body movements, spindles and slow waves in eeg alternated with active sleep (irregular respiration, eyes alternatively closed, half-open or there were movements of bul-bus oculi, increased frequency of body movements) in about 50- to 60-min intervals. The individual periods of quiet sleep lengthened with age to approximately 22 min on the average. The total duration of quiet sleep increased significantly with age from 16.7% in the 2nd week to 34.8% in the 24th week. The most striking changes took place in the first 12 weeks of life.

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