Help! My DS, who has slept through the night since he was 8 weeks old, decided last week he would wake up every 1-2 hours overnight and cry.

He can re-settle in two minutes if I fix his sleeping position and pacifier. But what the hey?? He did get his first tooth a week ago but this seems to have started after that, not because of it. I assumed it was a bad night or two ... But now we're going on 8 nights of the same thing.

Has he lost the ability to connect his sleep cycles??