Re: 3 year old waking up at night again :(
what exactly does your son do when he wakes in the night? is he up playing, or crying, or what??? how do you react to his being up? do you talk with and try to reason with him?
my daughter does the same thing to me at night, and i have found that if i go in and tell her it's bedtime and that i can not talk to her because she needs her sleep, then give her one kiss and leave the room, she might cry for a minute or two but then she goes back to sleep. it's the only thing that works for her. if i go in and try to talk to her or reason with her, she'll just keep me in there talking forever! if i go in and lay with her, she'll keep waking up the following several nights until i finally go back to the not talking to her rule and let her cry it out again. did any of that make sense???
i'd recommend the not talking to him at night rule and see how that works. you might explain it to him before he goes to bed, that he's getting to be a big boy and he really needs his good rest, so the new rule is that mommy can't talk to him after he goes to bed.... something like that. good luck!