Sleep problems have been linked to externalizing problems during adolescence. There is limited knowledge as to the temporal childhood sleep characteristics and subsequent adolescent externalizing problems. Our aims were 2-fold: 1) to examine whether sleep characteristics are concomitantly associated with externalizing problems at 15 years and 2) to investigate whether childhood sleep characteristics predicted externalizing problems at 15 years. Longitudinal data on 1441 children were collected by questionnaires and interviews from 5 months to 15 years (13 waves). At 15 years, sleep characteristics and externalizing problems were completed according to the adolescent’s opinion. Childhood sleep characteristics trajectories (nocturnal sleep duration, nocturnal awakening duration and sleep latency) were completed according to the mother’s opinion (2.5 months to 10 years). Pearson correlations, t-tests and Anovas were performed (p<.05). Concomitant associations were found for sleep need (p=0.01), total sleep time during weekdays (p<0.001), daytime drossiness (p<0.001) and trouble waking up (p<0.001) except for total sleep time during weekend (n.s). We found that children which followed the long sleep latency trajectory presents significant more externalizing problems at 15 years compared to children which followed the short/normal sleep latency trajectory (p=.02). Concomitant adolescent sleep problems (sleep need, total sleep time during weekdays, daytime drossiness and trouble waking up) are associated with externalizing problems at 15 years whereas childhood long sleep latency predicted the emergence of externalizing problems at 15 years. Institute of Statistics of Quebec.