M.C.
I have a 12 month old and she does the same thing! She will not sleep in her crib, I tried every method out there and it didn't work. So we sleep together also. Every night she wakes up 2 or 3 times and just wants to nurse for a minute and then goes right back to sleep. I don't think she is hungry because she only wants to nurse for a moment. The only thing I think it can be is a comfort thing. I think she just wants to know that I am still there and make contact with me and then she is comforted back to sleep. Dr. Sear's has a great website and he calls this a "high needs" baby. He explains this type of personality very well and I suggest you check out his website.
I don't have any suggestions except to say what I tell myself...she will outgrow this stage. They are little for such a short time. I can co-sleep with her because soon enough she will be old enough for a toddler bed. Soon enough I will be able to sleep through the night again. I will sacrifice for my child because that is what mothers do, and soon enough they will outgrow this stage. Hang in there. You are doing a good job!