S.T.
Personally, I would go in and take care of whatever he needed. In this case, his paci. He has only been in this world for 4.5 months, so he is still adjusting.
Plus, the more sleep he has, the more sleep you have. At that age, if my kids got the the awake point, they would want to be awake for a while, happy as clams, but I was still missing out on sleep.