I actually disagree with "attachment parenting", as it lessens the child's ability to learn independent behaviors and gain the self confidence to do things on their own. I, myself, am a product of a child who was raised with "attachment parenting". I was pretty much completely dependent on my mother for the most basic of activities, such as writing reports and doing my own hair, until I was nearly in high school. Not only this, but up until I was nearly 9-10, I would ask if I could sleep in my parents' bed if it was stormy out at night. This resulted in me not being nearly as skilled or independent as I should have been later on in life.

I grew to be ashamed of my behaviors, especially around my peers, and this later manifested into isolation, self confidence issues, AND depression. Now, part of that was because I'm pretty much convinced I had MI from a very early age, but a huge part of it was my mother thinking she was helping me by literally not instilling a sense of independence and the ability to do things for myself from said early age.

Now, I'm not saying to be cold and indifferent to your son, but rather, find a way to teach him that he's a big boy now and can do things for himself, like sleeping in his own bed, in his own room. He probably needs a mother who can instill confidence through teaching him skills and abilities, rather than doing whatever for him.