DD has always slept in her own room w/ no problem,and even dud when we stayed at our in-laws for a month while waiting to close on our house. But for some reason, she's waking several times a night, wanting us to lay down w/ her until she falls back asleep. Sometimes we sit w/ her and sometimes we leave as soon as she's back down. But this is getting ridiculous (she's waking as much as DD2) and we are exhausted!

Any thoughts?