DS is 13 weeks old. He has always been a very straightforward baby, he would wake at night hungry, feed and then settle himself back to sleep. For the past 2 weeks he's been sleeping through from 7-7 with a 10pm dream feed.
Since Wednesday night something has changed and I have no idea what. He wakes at 2:33am exactly and wriggles and shuffles and makes little cries. He occasionally has a dummy and by using that I can sometimes settle him back to sleep for another half an hour but generally he is wide awake.
His cues are usually very easy to read and he isn't waking hungry, although invariably by 4am he has made himself hungry. After feeding he will go back to sleep but snuffles about noisily for half an hour or so first.
I have no idea what is waking him- he isn't hot or cold, he has always been swaddled in a Woombie and I've tried stopping swaddling but it makes no difference. He has recently had a big growth spurt and jumped from the 50th centile to the 91st, but I would have expected any sleep disruption to happen during the growth spurt rather than after.
Any ideas or suggestions? I am back at work two days a week and don't know how I'm going to cope next week after being up half the night.