So my 18month old has just switched from a sleeping bag to a duvet. We are on the 3rd night now and its been taking her about an hour and a half to go to sleep. Once she's asleep I don't here anything from her so I think she may prefer it but I'm not sure why its taking her so long to go to sleep. She seems a little obsessed with sitting up pulling at duvet laying down back up again. Question is , is this normal and will she get used to it or should I put her back in a sleeping bag? TIA