Day sleep dramas

My girl has always been good at going down for her day sleeps, I feed her, change her, put her in her sleeping bag and into bed with her Rabbi. She usually drops off quickly if she has no wind. Lately she has been a toad and not going to sleep. I have made her bedtime later on, and she is giving me all her tired signs but she just wont go to sleep, she rolls over and then does triangles (bum in air while looking through legs LOL). Any ideas?

My DS is in a Safe T Sleep, because he can be 99% asleep, but as soon as he rolls over - BANG! Wide awake!! So he's tied to the bed lol, so that he can sleep on his side which he loves, but can't roll all the way over.