system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If later school start times are found to improve sleep and daytime functioning in adolescents, why aren't school start times changed?
gpt
A lot of schools I've worked for have taken the parents into consideration.  For instance, most jobs start at 9:00am so starting school at 8:00am gives the parents the time to get their kids off to school.  The same went for snow days.  In Rockford IL the school was blasted for having school on some of the worst days in the winter and the school tried to remind people that school breakfast and lunch were the only meals many students got so they stayed open for that reason. 

And also tradition and bureaucracy.