The sleep/wake cycle in 4-to 14-month old children: general aspects and sex diferences

The sleep/wake cycle of 39 children, 4 to 14 months of age was observed and recorded continuously (24 h per day) over a 4-month period, one ful week per month, from November 1986 through February 1987. Total sleep time per day was analyzed the different age groups and for the two sexes. A decrease in total sleep time is shown as a function of increasing age for the whole population. analyzing boys and girls separately, a differential effect on total sleep time was demonstrated, girls tending to sleep more after 10 months of age