i think that because you are seeking out other opinions, you already are leaning towards letting them play later than you originally thought was an acceptable time frame. i think your willingness to rethink your position (whether you change your mind or not) leans towards excellent parenting. i do not want to tell you what i think is right for your family, as i have no idea. in my family, we have all been seeing later bedtimes (which is working well for us). we live in maine (where summer is precious and short). staying up later has just been a natural progression (with all the extra hours of daylight). as summer starts to come to it's end, i will get my daughters back into their routines for school. i'm sure this won't be easy since it will still be light out at 8pm come mid-august. right now, i am just following what seems like a natural reaction to the season of sun (more time in it). that said, i don't believe in one size fits all plans for children/families. there are so many factors to consider like personalities and work schedules of parents. as i tell my kids about new foods, 'try it you might like it'. maybe you could let them have a night or two with later bedtimes and see how it works in your family. one last note, my kids kept getting up at 6:30 -7am when they first started going to bed later. after a week, they were sleeping until 8am. Now they are waking up between 8:30 and 9. i think it takes them a bit to shed the internal clocks they have from their regular spring/fall/winter routines. i hope this was helpful.