It's normal for pups that young to sometimes not be able to hold their bladder all night. I try to judge it, if he just went out I might not take him out right away and see if he persists. Night time potty trips I don't make a big deal about either unlike day time potty trips, take the pup outside, wait a few minutes if he doesn't potty then right back in the crate he goes. Don't play with him or reward him in any way for waking you up if he didn't go. I don't treat for night time potty trips but I will use a quiet verbal reward.. that way the pup isn't learning to just get up in the middle of the night to get snacks. Around that age my pup was waking me up at least once in the middle of the night, and after a week or so he was able to sleep all the way through. Every puppy is different. You must keep in mind he is just a little baby still.