well I am one of those mean mummys who believe if they have been sleeping through and then start to wake I will just let the cry themselves back to sleep after I make sure they havent go any legs stuck in the cot. I do not talk to them or give them any cuddles as I think this will encrouge the behavier I know this sound mean but I have found that with all 3 of my babies it will only mean a few sleepless nights before they get the idea and get themselves back to sleep. I think once a baby is over 12mth then they dont need anything through the night and therefore should be sleeping through iykwim. Good luck nothing worse than a early riser. He could be getting his tummy teeth this will alway make a otherwise good sleeper into a terrible one.