Mobile Sleep and Growth Study

Inclusion Criteria: 1. Males or females age 10 to 12 years. 2. Speak, read and write in English. 3. Parental/guardian permission (informed consent) and child assent. 4. Have a computer or a tablet computer with access to the Internet, or own a smartphone with a data and text plan. 5. Typically spend 8-9 hours in bed at night (e.g. 8 hour time in bed: go to bed at 10pm \& get out of bed at 6am). Exclusion Criteria: 1. Any clinically diagnosed sleep disorder (e.g. sleep apnea). 2. Syndromic obesity. 3. Diagnosed with a psychiatric disorder \[e.g. Attention-deficit/hyperactivity disorder (ADHD), depression, anxiety\]. 4. Diagnosed with an eating disorder. 5. Musculoskeletal or neurological disorder that limits physical movement and activity. 6. Use of medications (prescription or otherwise) known to affect body weight and/or sleep.