The goal of the study was to examine the developmental course of sleep consolidation
from infancy to preschool. The sleep of 50 healthy infants aged 3 months was
recorded, at home, with actigraphs (computerised activity monitors). Follow-up
recordings were carried out at 6, 9, 12, 20, and 42 months (due to attrition and
occasional technical failures, complete sleep records were not available for all
subjects at all ages). The main findings were that by 12 months, nocturnal sleep is
well organised; nevertheless, sleep continues to become less fragmented and more
efficient beyond the first year. The child’s level of motor activity
during sleep, and the overall sleep efficiency were moderately stable across time.
In contrast, sleep duration and the number of nightwaking episodes were unstable
from 3 to 42 months of age. Taken together, the continuity and change in the group
trajectory of sleep maturation, as well as the stability and the periodic
instability in the individuals’ rank across time, may be interpreted to
reflect the interplay among constitutional, maturational, and experiential factors.
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