DS co sleeps and the DDs have their own room. When we have tried to let them sleep in our room (when Im being sooky and want to cuddle a baby) they think it's play time and never settle. No joke I've been up 3 hours trying to settle DD1 because if she can see us she thinks she doesn't need to sleep. Coincidentally all 4 of my kids are brilliant sleepers and great at self settling.