0207 Impact of Changing School Start Times on Teachers/Staff

Introduction Delaying middle and high school start times is important for increasing sleep in students. However, no known studies have examined the impact of changing school start times on the personal sleep and well-being of K-12 teachers/staff in a district having made such a change. Methods In Fall 2017, the Cherry Creek School District changed school start times at all levels: elementary school [ES]: from 9:00 to 8:00 a.m.; middle school [MS]: from 8:00 to 8:50 a.m.; high school [HS] from 7:10 to 8:20 a.m. Teachers and school-based staff completed online surveys in Spring 2017 (pre-change n=2287) and Spring 2018 (post-change n=2702). Questions included weekday bedtime [BT] and wake time [WT], with total sleep time [TST] calculated as the difference between WT and BT; engagement with family/friends (dinner, talking about day); and PROMIS Sleep Related Impairment (SRI). Results Post-start time change, ES teachers/staff reported significantly earlier BT and WT (9m and 10m, ps