Cold Turkey ...where ever he is sleeping, put him to bed after some nice stories, then you have to leave ,yes you will feel guilty, he will yell ,he will come out, take him quietly back, no noise, you may have to do it a lot, but he will get it in the end, consistancy is the answer ...if you give way you are back to square one, or you can have the Family bed that a lot of families do have, and enjoy its a matter of choices. .