Over the years I've gone back and forth with this. I've discovered a few things:
Yes, in the summer I get more time in the AM, but then I also get NO time with DH in the evenings with kids falling asleep around 8-9PM, depending on the evening and how they may or may not have napped during the day. As much as I like sleeping in the mornings, right now I REALLY want my evenings back!
There are a lot of AM noises here that act as cues for the girls to wake up. We live close to a commuter and freight train line and when the commuter train sounds (and even regular road traffic sounds from a half-mile away) cut through right after their last REM cycle in the mornings, that's about it, And if that doesn't do it, the sounds of the traffic plane buzzing the trees of our neighborhood
right before 7:30AM does it most of the time. When the clocks change, so do when those sounds happen relative to their sleep cycle, which is a BIIIIIG help (assuming no sirens - we also live close to one of the roads the fire trucks regularly take
).
When Josie was little, I was able to tweak her bedtime a bit at time changes by messing with the amount of activity and light she got at the end of the day. If necessary, I could also get her to catnap with a little car trip somewhere.
That way I could move her bedtime later - at least till the least little sleep during the day meant she'd be up till past 10PM.
At this point, I'm not gonna stress it. The girls keep stretching out their days these days, so by the time change I should be able to get them to bed at 7:30, spend a nice couple hours w/DH, and get myself to bed around 10PM. Anything important after that, well, that's why we have a video recorder, right?