Hi D.,
I have to totally disagree with the advice that has been given so far. I have a 12.5 month old that cosleeps with us, and we've gone through periods of restlessness off and on since he started getting teeth. You mentioned that your little one hasn't cut any teeth yet - I would wager that he's about to.
My son has cut 4 teeth so far, and with every one, we dealt with some restlessness at night for a couple of weeks, followed by total relief when the tooth broke through. Incidentally, this has also happened when he's had a cold and been having a harder time breathing because of congestion.
What's worked for us is homeopathic teething tablets (you can get them at Safeway in the oral care area, or at any natural foods store), and Natrabio teething relief liquid (at natural foods stores). We give him some of the drops before we put him down, and if he becomes restless, we give him tablets or more drops. Oh, and the tablets dissolve pretty much instantly, so no worries about choking or anything like that. He doesn't even wake up, just takes his drops or tablets and he sleeps peacefully for another few hours.
Don't listen to people who say that he's too old to cosleep. Plenty of people have a family bed for years, and everyone sleeps just fine. As long as it's working for all of you, keep doing what feels right to you. People just tend to be negative about things that are different from what they know.
Good luck, and feel free to send me a message if you want more information about anything!
N.