This study examined the impact of school start times on student achievement, attendance, and graduation rates for high school students. Data from a purposeful sample of 256 high schools across three regions centers (Region IV, Region V, and Region VI) in southeast Texas for the 2017-2018 school year were analyzed. These 256 high schools were sorted by size (small, medium, and large) based on student enrollment. Additionally, interviews from 15 superintendents provided a unique perspective on the process and implementation of altering high school start times. Findings of this research indicated that delaying school start times had a positive impact on achievement, attendance, and graduation rates. Specific insights are provided in terms of the logistical, practical, and political aspects behind the healthy alignment of school start times and the internal clocks of teenagers.