Mackenzie was a great sleeper until 13 months. It was crazy, she would just wake up and cry for no reason (that we could work out anyway). She would wake 3-4 times a night - sometimes we could settle her other times she would be away crying for 2 hours. She will be 2 in a few weeks and 4 weeks ago we put her in a bed and she was been great! The only thing I can think of is she was teething alot over the last 6 months and perhaps being in a cot she felt closed in? Who knows, it's great fun this mum guessing game thing!