Kyson sleeps in a sleeveless sleeping bag like your DD. He wears a pair of winter jimjams on underneath. I also lay a medium blanket over him when he goes to sleep. He sometimes wriggles out from under it before he falls asleep, so I sneak in before I go to bed and make sure it's over him. I doubt it really makes much difference though, but I like to peek in on him one last time before I go to sleep, hehe. We keep the heating on overnight at about 18 degrees though, so it never gets really cold. I think if she was getting too cold though she would certainly wake and let you know