DD has always been a fab sleeper, from 2 weeks old she would sleep from dream feed through to 7am but the last week she has been waking up anytime from midnight to 3am then again every hour right through to morning, room temperature is fine, nappy ok etc. She wakes up and chats to herself which I ignore hoping she'll settle, this turns into a cry after a few mins, I give her a dummy and she goes back off to sleep for a hour, then stirs again, dummy & back to sleep again. This carries on until getting up time. Before the last week she'd self soothe, wake, chat, suck thumb, sleep again but only occasionally, typically she'd sleep all the way through without a peep. She seems to have forgotten how to self soothe.
Has anyone else experienced this? Any tips?