This happened to me too! For a time, my baby decided that 2am was a great time to play and poop. Needless to say, this drove her co-sleeping parents nuts!
She grew out of it though. I think it was from a change in rhythm when we went for a family trip and she got so tired from being out all day that she slept so well and so long at night.
When we got back, she lost the 2am habit.
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