Adolescents (11 to 14 years old) were recruited from the local community through flyers, word of mouth, and through advertisements placed in local school newsletters. Following school newsletters and with the approval of the administrations of each school, sleep laboratory staff gave a brief presentation to the adolescents during school time. The study was approved by the IRB at SRI International. Parents gave informed written approval for their children to participate and the children gave assent to participate in this longitudinal study. The procedures described next were conducted at the baseline visit and at follow-up, which occurred on average 7.3 months later (range=4 to 10.7 months).
