STaRtS: Start Times and Restful Sleep

Visit 1: Fall 2019, Enrollment and baseline measurements After obtaining informed consent from the parent and assent from the student, baseline data will be obtained. Visit #1 will take place on campus during free periods, lunch or immediately after school and would not interfere with studies. This will include basic demographic data (age, gender) and a questionnaire asking about their average commute time and type, their afterschool activities, as well as an Epworth Sleepiness scale and validated survey of chronotype (Horne-Ostenberg). Subjects will also undergo a standard 10-minute Psychomotor Vigilance Test (PVT) and be given a FitBit. Investigators will assist them in installing the FitBit app and a screen time app, Moment for on their phones. Including the informational part of this visit, enrollment and questionnaires will take about an hour.

Of note, neither the app nor the FitBit will collect geolocalized data. The app does not track and record content, but only gives us the number of minutes per day the phone is on. There is no cost for the app nor does it use cellular data or wireless connection. The data will be collected during study visits rather than in real time.

At this meeting, subjects will be instructed to wear their FitBits as much as possible, especially while sleeping or during physical activity, and to make sure that the screen time app is working on their phone. The investigators recognize that the students will not likely be able to wear their FitBit at all times, but investigators will ask them to use their devices as much as possible. Periodic email communications will be sent out every other week reminding them to continue wearing their FitBit.

Visit 2: Winter 2019, 12-week time point and FitBit collection. Investigators plan to end the study period on December 19, 2019, the Thursday before students go on winter vacation. Depending on when investigators start the study, this would be about 12 weeks after the beginning of the study period (including a non-school week and a few long weekends). At this visit, investigators will repeat all study procedures from visit 1. Investigators will collect the FitBits, facilitate the export of screen time data and allow them to delete the Moment app on their phones. Subjects will be instructed to look for further communications from us at the beginning of the next year. This visit will likely take about 30 minutes.

Visit 3: Fall 2020, Start time change, FitBit redistribution. Francis Parker will switch to a 45 minute later start time for the 2020-21 school year. On the same week of school as the first visit, investigators will hold a meeting in which subjects will repeat all study procedures as in visit 1 Subjects will be given the same FitBit as subjects used in the last study period. Investigators will supervise them as subjects install the FitBit and Moment app on their phones. This visit will likely take about 30 minutes.