My 5yo DD and my 2yo DS share a room. DD gets really cross when he doesn't sleep in there all night lol. I did it to get DS to sleep in his bed and so far it's working great. We even have night terrors to deal with. They are not quiet. Both my kids get them (lucky me - at least they're at different times a night). Still works. Occasionally DS wakes up (DD is far noisier with hers) but it's rare, and he's a light sleeper. If he does he usually is happy to go back to sleep as long as we tell him Darcy's still there and she's OK.