If you have 2 or more DCs of different ages sharing a room, how do you do bedtime? Do they go to bed at the same time, or at different times?
My 20 month DD and my 4.5 DD share a room. I usually put the baby down first, but if she's not asleep 20-30 minutes later when my older DD goes to bed then it all turns into a mess of crying girls and it turns into a very long night. I can't really put the baby down to sleep any earlier (because of a relatively late 1 nap at day care right now) and I don't want my older DD staying up much later either.

Any suggestions?