Inclusion Criteria:  Currently own and regularly use a smart phone Body mass index >27 and ≤ 43 Poor sleep health on one or more of the sleep health dimensions  Exclusion Criteria:  Presence of an unstable condition requiring physician-supervised diet and exercise Physical limitations precluding ability to engage in moderate-intensity physical activity Pregnant or intention to become pregnant during study Current treatment for a serious mental illness Being a current shift worker Reported alcohol intake > 4 drinks/day for males and > 3 drinks/day for females Current participation in a formal weight loss program, loss of ≥ 5% weight in past 6 months, or current use of weight loss medication History of bariatric surgery Planned extended vacations, absences, or relocation during study Another member of household is a participant in the study Score > 32 on the Eating Habits Checklist, an eating disorder scale