Did you have a good night out? (i'm presuming it was pleasure and not business!)
He will likely wake if he needs more milk. you could try dream feeding if you want - it's up to you.
Just by the by, it's pretty unusual for babies to go all night without milk at this age. It may be that he's ready for it, but it may not last. Just something to bear in mind. It's not unusual at all for babies to still need night feeds at 12 months or even longer (for some!).