Well, speaking about my friend who had this "problem".... (her son was a little older though about 2.5 years old), but for her... she started diluting his before-bed bottle of milk with water.... then gave him the smaller bottle (not the 8 ounce size).... then, she told him that if he wants his milk, "he" can go himself to get it in the fridge. (their kitchen is downstairs). She said that for her, and per her son's personality/understanding, that this worked. He is now off his bottle. She didn't do this over-night... but over a span of a few months.
So this "solution" worked for her and she got creative about solving it this way. Now, he just uses a sippy bottle of water.
Some kids are just more "oral" than others, and it soothes them. For my son, he just likes to hold something as he sleeps... even if it's an "empty" bottle... it's fine with him. Which I put water in it, and even if the bottle is empty though, he'll hang on to that and his stuffed cow.
Maybe your son will take to having a "lovey" to sleep with too? Something to "replace" the bottle????
Good luck hope this helps in some way,
Susan