Hi B.,
Have you tried to let him cry it out a little and go back to sleep on his own? When my boys were that young, I used to do the same thing that you are - I would jump out of bed, comfort them, hush them and then crawl back into my bed. I figured that if I caught them and calmed them before they got into a screaming fit, then we would all be able to go back to sleep.
But, I figured out (okay - maybe my husband pointed it out ;)! ) that I was pretty much training them to rely on me instead of figuring out how to get comfortable again on thier own.
Try letting him cry it out a little. Even if he cries for a few minutes once or twice a night, you won't be up all night long.
Also, consider that you may just have a noisy sleeper. My older son is a silent sleeper, he sleeps deep and does not make a peep unless he's not feeling right. My younger son, who is 2, on the other hand, talks in his sleep, moves all night long and occassionly even cries out from what seems to be a vivid dream. By the time he was 6 months old, I had to just turn off the baby monitor so that my husband and I could sleep, knowing that if he needed me, I'd hear him.
Good luck!
--R.