K.B.
Yeah - I guess thats probably not the best thing to do because you dont want to end up "training" him to depend on you to come into the room with him to get back to sleep. Although I would probably be doing the same thing in your shoes. How couldn't you? You want them to feel safe and loved. Don't feel bad about it.
When my daughter wakes up and tries to go play in the middle of the night, I just tell her nicely to go lay back down in bed, its still bed time, etc... and she doesn't give me any problems about it. Lucky me I guess. Maybe play some sleepy-music for him when he wakes up in the middle of the night to help ease him back to sleep? Help him get comfy again and say goodnight before you leave the room like you do earlier in the night?