The sleep/wake cycle in 4- to 14-month old children: general aspects and sex differences
Menna-Barreto, L.; Montagner, H.; Soussignan, R.; Koch, P.
Brazilian Journal of Medical and Biological Research 22(1): 103-106
1989
ISSN/ISBN: 0100-879X PMID: 2758163 Document Number: 336999
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 full week per month, from November 1986 through February 1987. Total sleep time per day was analyzed for 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.