Studying Melatonin and Recovery in Teens

Inclusion Criteria:

Patients/youth:

* Age 12-18 years
* Participants undergoing elective major musculoskeletal surgery for eligible conditions
* California state resident
* Regular access to internet and smartphone
* Can read and understand English or Spanish

Parents/caregivers

* Biological parent or legal guardian of youth
* Can read and understand English or Spanish

Exclusion Criteria:

Patients/youth

* Prescription medication for premorbid insomnia
* Cognitive impairment or developmental delay
* Does not agree to a 1-week washout if taking over the counter supplements or other sleep aids prior to the start of the study medication
* High risk for sleep related breathing disorder
* Chronic medical condition that is severe/systemic or requires regular treatment regimen
* Psychiatric admission in prior 30 days
* Patients that underwent major surgery in the last 3 months, or those that have not fully recovered from a prior surgery
* BMI ≥ 99th percentile
* Enrollment in another therapeutic study
* Any serious underlying medical or psychiatric condition, that, in the opinion of the investigator, would contraindicate the patient's participation in the study