Research shows later start times improve academic performance, but many in education community opposed being required to start later.
Author won support to set middle schools to start no earlier than 8 a.m. and high schools to start no earlier than 8:30 a.m.
Some campuses are quieter and tardiness is down as schools shut off their bell systems
An 8:30 a.m. start time for middle and high schoolers could add $10.2 billion to California's economy within a decade, according to a RAND study.
