California is the first state in the U.S. to ban early start times for middle and high school students.

Governor Gavin Newsom signed a bill that mandates later start times at most public schools. The law reportedly prohibits middle schools from starting before 8 a.m. and high schools from beginning before 8:30 a.m. The reportedly derives from studies that note teens perform better and are healthier when schools start later. Districts in California will have three years to properly shift start times for schools.