The sleep/wake cycle in 4- to 14-month old children: general aspects and sex differences.
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.
Departamento de Fisiologia e Biofisica, Universidade de São Paulo, Brasil.
L
L
Menna-Barreto
H
H
Montagner
R
R
Soussignan
P
P
Koch
D000367:Age Factors; D002940:Circadian Rhythm; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D008297:Male; D012737:Sex Factors; D012890:Sleep / Q000502:physiology*