Hi L.,
It is pretty typical for little ones to change their sleep habits as they learn more about exploring their environments. As they get older, they also "realize" they are alone when they wake and may need some comforting to know you are close by. I recommend responding to your little ones needs and going in to comfort him/her. Just remember - "its just a phase" and "this too shall pass". Those are the cardinal rules of being a parent. As your child grows and changes he will have times where he sleeps well and times when he doesn't. When my son got his 1st molars, he didn't sleep through the night for 2 months! Just comfort him, let him know you are there and he will work his way back into his good routine.
J.
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