Doing great with potty training but poops in sleep?

texasgurl

I started potty training last week and DD is doing awesome. She tells me everytime when she needs to pee and has had very few accidents, none for several days now. She wears a diaper for nap and sleep. But something has changed about her pooping schedule....I am at a loss. She has pooped on the potty and was very excited about it but its now been a couple of days and she keeps pooping during her nap or during the night! Could she be holding it during the day and then relaxed enough to go at night in diaper? Or is this just a fluke? Not sure what to do about it. Any thoughts or experiences?