I just wanted to add that my DD is 17months and we are having random NWs too, several per night. All DH or I have to do is go in, replug her dummy then she'll lay down & settle back off immediately. It's so so difficult to know what to do.
Tonight we are planning to leave her a bit longer than we do normally, to see if she will resettle alone as we know she can resettle and replug herself. Otherwise, I might try what Lucysol suggests, by not actually going into the room but telling her to lay down & go back to sleep.
Lucysol: did you open the door and speak to DD? Or do you not close her door? Or did you just talk "through" the door if it was closed? Sorry to threadjack, I'm struggling with the lack of sleep too. Perhaps we can all learn from each other's tips!