Same with my boys. 9pm school nights. The youngest son can fall asleep in 5 minutes. You just have to get him still. The oldest son will lay there for 30 - 45 minutes before he falls asleep.
7:30 bedtime for the little one. Right now, she falls asleep pretty quick.
My 5 year old, lilGatorCheech, hates bedtime. He is already dealing with ADHD and separation anxiety (something to do with his biological mother running away while he was asleep, and he now sleep in that same bedroom that he was in the night she ran away). Lil effer fights bedtime every might. I freaking hate bedtime. Hate. It. Can't figure out how to solve his issues. Not enough bedrooms in the house to switch him out, til I sheet can the two foster kids