Just a quick question

Natalie

My son is 4 months old and had he last set of jabs. Last night he did not sleep, was up 2 hour after I put him to bed and stayed awake till 3 hours! Today he has just slept I’ve tried waking him but his just so tried and is falling asleep. His not drinking much milk. I don’t know if this is because of his jabs? Also worried he will be awake all night haha