The sleep duration of young people has declined over the last 100 years, and numerous problems have been linked to this decline, including poor academic performance, a lack of coordination, and increased aggression, hyperactivity, and obesity.1 This decrease in total sleep has been attributed to later bedtimes rather than earlier wake times. Electronic media use immediately before sleep has been hypothesized to affect sleep patterns through time displacement, depression of melatonin, and cognitive arousal.1 This study aimed to describe the most popular activities in the 90-minute period before sleep onset in preadolescents and adolescents. It also examined the relationship between presleep activity and sleep onset, particularly as it relates to electronic media use.