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This paper summarizes the main aspects of sleep and waking development and shows results about awakening as a function of age. Awakenings come mainly from active sleep and their number decreases with age. Understanding the awakening process should take into account the development of sleep and waking states and of circadian rhythms and homeostatic processes.
Wakefulness distribution during a 24-h period was studied in ten low-risk preterm and near term infants through video-recording. The highest amount of wakefulness was found in the night-time period between 02:00 and 05:00 h. This result is different from what was observed in infants during the first year of life, and similar to what was found in the foetus.
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