Hey L.,
My 10.5 month old does the same thing. He has never slept well. People have said, ole just let him cry it out, he will eventually stop. HA! He just works himself up til he throws up all over his crib, then I have to get up and change him and the whole crib. Then, guess what, hes hungry after all of that! Not fun at midnight!
Anyways, not to ramble, but I feel your pain. Last night I put him down at 9:30 PM. (People told me to start putting him to bed earlier, so I tried this too. He used to not go to bed until 10:30 to 11PM.) My son was up at 12, 2, 4 and 7. Which is good for him. Sometimes its a time or two more per night.
Have you checked for ear infections? My son has had chronic ear infections for going on 2.5 months now. We are getting tubes on Friday, so I hope and pray this is going to help with the night pain and waking. And hes teething on top of it.
My suggestions would be to feed him dinner late, like 30 to 45 mins before bed. Do a good warm bath with the night time baby wash and lotion. Do PJs then nurse or a bottle. Give baby a dose of Tylenol or Mortin (if you suspect pain) then rock to sleep (or however you do it).
Also, use a sound machine or a fan. We bought a sound machine at Walmart for like $20. It does all kinds, but my son likes the waterfall and the rainstorm. Also, we have started limiting my son to one bottle of milk per night. He gets one before bed, but only one small one at night. And lots of times I water that bottle down. Otherwise, he just gets plain water in his bottle if he wakes up more than that.
My only other suggestion is put your baby in bed with you. At 3AM when he has done been up 4 times, I just put him beside of me. Funny how he doesn't wake up again til morning! Its much easier because I sense him waking up and can immediately pat him back to sleep versus getting to his crib before he has stood up and started screaming. By then, he has done woken himself up.
I hope any of this helps. I know I rambled quite a bit! But, I didn't get much sleep last night either! Ha,Ha!