Improving Sleep, Decision-Making, and Eating in Adolescents With Obesity

This study is being performed to understand the effects of a lifestyle modification and sleep intervention on weight loss outcomes in adolescence. The main question the study aims to answer is: \- What are the initial effects of a lifestyle modification and sleep intervention, including effects on weight, eating behaviors and dietary intake, and sleep? Participants will: * Participate in remote, group-based, weekly weight loss and sleep coaching for 16 weeks. * Complete study assessments at baseline (pre-intervention), mid-intervention, and post-intervention. * Complete daily sleep diaries for three 7-day periods at each assessment point.

Inclusion Criteria: * Ages 14-18 * Fluent in English * BMI percentile ≥ 85th percentile for sex-and-age * Has a parent or guardian who is willing and able to participate * Has at least one sleep disturbance. Eligible sleep disturbances are: a. Advanced sleep timing (sleep onset 11:00pm or later for 14-16 year-olds or 11:20pm or later for 17-18 year-olds at least 3 times per week), b. Difficulty falling asleep (taking ≥ 30 mins to get to sleep 3 or more nights per week), c. Short sleep (obtaining \< 7.5 hours of sleep per night 3 or more nights per week), and d. Sleep irregularity (having more than 2 hours of variability in sleep-wake schedule across one week Exclusion Criteria: * Experience of weight loss of ≥ 5% of body weight in the past 6 months * Current use of insomnia medication * Having recently begun or changed the dosage of any medication known to affect appetite or body composition within the last 3 months * Currently taking weight loss medications * Currently taking insulin * Diagnosed diabetes (type 1) * Any condition prohibiting physical activity * Diagnosis of an eating disorder * Diagnosis of obstructive sleep apnea * Recent or ongoing problem with drug abuse, alcohol abuse, or addiction * Currently pregnant or less than 3 months postpartum * Anticipation of a possible pregnancy in the next year * Unwillingness to report possible or confirmed pregnancies promptly during the course of the trial * Currently participating in treatment for eating or weight concerns * Does not have regular access to Wi-Fi connection to participate in study interventions.