145 SLEEP-WAKE PATTERNS IN OVERWEIGHT PREPUBERTAL CHILDREN

SP. PWSP was 10 h in 34.1%. The SD median for the previous 24 hours was 10 h [IQR 9;11,5], and SD was lower than PWSP in 12.8%of the G1 group members. The G2 group was 50.2% male, with amedian age of 4.88 y [IQR 2,1;8,1], with a total of 267 completed questionnaires. PWSP was 10 h in 41.2%. The SD median for the previous 24 hours was 10.5 h [IQR 9,5;12], and SD was lower than PWSP in 7.7% of the G2 group members. A significant association was found between the occurrence of an AF and a shorter-than-usual SD during the previous 24 hour period (p=0.025). In the 1-3 and 3-6 age groups, the rate of AF was significantly lower in those children who had daytime naps (p=0.002 and 0.04, respectively). There was no significant association between SD and the occurrence of AF. Conclusions: This study provides evidence of a relationship between acute sleep deprivation and AF in children and also indicates that daytime naps have a protective effect against AF in younger children. The level of sleep duration itself does not seem to have an influence on the occurrence of AF.