Clinical Research Directory

Inclusion Criteria: 1. Scoring less than or equal to 26 on the Composite Scale of Morningness OR Mid-point of sleep later than 4:30 AM for 18-24 yo and 3:50 AM for 25-30 yo on work-free/weekend days over the past month OR Night-to-night variation in sleep and wake times across one month of 2 hours or more. 2. 'At risk' in one of the five health domains: the emotional domain, the cognitive domain, the behavioral domain, the physical domain and the social domain. "Risk" is defined as scoring 4 or higher on one item from an adapted version of the Work and Social Adjustment Scale. 3. Age between 18 and 30. 4. English language fluency. 5. Able and willing to give informed assent. 6. If taking medication for sleep, the dose and frequency of use must have been stable for at least 4 weeks. Exclusion Criteria: 1. Presence of substance abuse/dependence, mental illness, physical illness, suicidality or developmental disorder only if it makes participation in the study unfeasible or if there is a significant risk of harm and/or decompensation if treatment of that comorbid condition is delayed due to participating in this study. 2. Evidence of sleep apnea, restless legs or periodic limb movements during sleep. Youth presenting with provisional diagnoses of any of these disorders will be referred for a non-study polysomnography evaluation and will be enrolled only if the diagnosis is disconfirmed or if the disorder is treated. 3. Night shifter worker where the shift is scheduled between the hours of midnight to 6am \> 2 nights per week. 4. Pregnancy or breast-feeding.