Type 1 Diabetes REst for Metabolic Health

Inclusion Criteria: * High school students between the ages of 14-19 years; * Diagnosed with T1D for ≥1 year; * Using an insulin pump or other automated insulin delivery system; * Have typically insufficient sleep, defined by ≤ 7 h per night on school days (assessed by actigraphy); * With or at risk for obesity based on either above-average weight (BMI ≥50th percentile) or parental history of obesity (BMI ≥ 30 kg/m2); * Tanner stage 4 or 5, based on breast development for girls and testicular size for boys. Exclusion Criteria: * Prior diagnosis of a sleep disorder (e.g., insomnia, obstructive sleep apnea) or an elevated screening score on the OSA subscale of the Sleep Disorders Inventory for Students-Adolescents measure * Regular use of medications affecting sleep (e.g., stimulants, atypical antipsychotics, melatonin or other sleep aids); * Regular use of medications affecting IR (systemic steroids, adjunctive diabetes medications); * HbA1c ≥12%; * Severe illness or DKA within 60 days; * IQ\<70 or severe mental illness impacting sleep or ability to participate in the study; * Night-shift employment or other obligations that would preclude adherence to the intervention.