Sleepless in Happy Valley

Ever since we moved Isaac into his own room and crib, he has not slept very well. He has progressively gotten worse and worse each night it seems. Right now he is waking up every 2 hours. He usually eats and goes back to sleep, but at least once every night he is just WIDE AWAKE and isn't hungry or anything! I am so confused. I ALWAYS put him to bed awake, and he always falls asleep within 3 minutes. I still swaddle him for every nap and at night, and I always give him his pacifier to fall asleep (otherwise he just breaks out of his swaddle and sucks on his hands). I just don't know what is waking him up all night! He used to be able to sleep for 6-8 hours straight. And I thought I was sleep deprived then- HA! Oh well. He still wakes up in the morning happy and adorable, and is a very good baby. He only whines when he is hungry or tired, so I know when I need to put him down for a nap. Overall, Isaac is a very sweet, adorable baby, and I consider myself lucky!! I love him so much, and would stay up all night with him if I had to. I just want what is best for him, and I think that is sleep!