My mom had that also, along with lots of burping. We always figured it was a combo of CC and constipation. She took colace to help, though we found fresh peaches got things moving “down below” better than anything else. Someone just recently mentioned pear juice for constipation as well.
BTW, I’ve taken ambien before with no problems, other than vivid dreams (which were kinda cool actually). I took it only when really needed – a “I must FALL asleep and STAY asleep” kind of night, maybe once every month or so. Alas, I ran out about 6 months ago.