Heya!
What's he doing when he wakes at night? Does he start screaming? Or does he coo and talk to himself loudly? My 9 month old has been doing some night waking for the last few weeks, mostly around 3-4 am because she's been sick. It became a habit, so she's been doing it every night or every other night since. What we've been doing is simple...ignoring it. Unless she starts screaming or starting to get really upset, that's what you sort of have to do, otherwise the problem just compounds itself. Otherwise, if it's screaming or getting really upset, then you go in, try and calm while he's in the crib using pat/shh or whatever variation you use, and then leave when he seems like he's ready to drift back to sleep. With our lo it only takes a min or two...then she goes right back to talking to herself rather loudly
Eventually she does go back to sleep...sometimes it takes an hour, sometimes it takes 15 mins or so. I know eventually things will get back to normal, but in my opinion it can't come too soon!
That's the best advice I can offer...I know it's not much, but I hope it helps!
*HUGS*
Sonya =P