Almost everyone awakens at some point in the night. The thing about babies is they have to learn to go back to sleep nicely. It's a hard thing for some of them to learn. I would like to suggest that you definitely go in and console him, but try your hardest to avoid picking him up- that can become a habit that is hard to break and he will start "needing" it. If you can put the side of the crib down, do so and lean in to hug him. If you can't, I'm not sure what to do- it's so weird that some of them have sides that don't go down. He will try his hardest to get you to pick him up, but don't let him force you to- just love on him and assure him that you're there and will always be there when he needs you. It's probably teething, too- Ibuprofen always worked great for us- we gave it to him before bed every night during teeth-breaking-through time.