My 21 month old is a very active sleeper - rolls around he crib, switches sides frequently, etc. She's always slept in footie PJs because I've always been worried that separate top/bottom PJs will ride up her torso as she moves around all night. Last summer we used very light Gerber footies, but they only go up to 9M and she's now in 18-24 month sizes and all the footies for that size that I can find are warmer. There is AC in her room over the summer and she won't keep a blanket on with all the movement, so I'm looking for something warm-ish but not as warm as regular footie PJs are. Am I overthinking the separates issue or is there a good solution for active sleepers I haven't considered?