Fourth Grade Bedtime is 9:30?

My fourth grade daughter polled her classmates about their bedtimes.  Of 24 responses, her data shows the median bedtime is 9:30pm.  I remember my childhood bedtime being 8:30, so these kids seem late to me.   I wonder what time they get up in the morning?

Our elementary school doesn't start till 9am, in contrast to the 8am start for our previous school in Los Altos.  Mercer Island shares buses among the schools, which is probably pretty common among schools like ours.  Los Altos skimped and didn't have bus service because the neighborhoods are so compact that kids all walk to school -- and the Prop 13-limited California school systems needed to save money wherever they could.