RecruitingBehavioural interventionTargeting Adolescent Insomnia to Lessen Overall Risk of Suicidal BehaviorThis study will test the effectiveness of a sleep-related primary suicide prevention program entitled TAILOR (Targeting Adolescent Insomnia to Lessen Overall Risk of Suicidal Behavior), which includes specific behavior-change strategies for adolescents at risk of suicidal behavior who suffer from difficulties falling asleep, staying asleep, and/or insufficient sleep.