I think that this is mostly a personal choice really. I am a mom of a 3 year old, and from experience (my nephew slept with his mother when his parents separated) I knew that when your child sleeps with you, it becomes a habit, and that habit is really hard to break. Especially when nobody wants to fight with their child or nephew in the middle of the night. I dont think that there is such a thing as part time co-sleeping because children learn quickly that it is acceptable, and will think that it is ok all of the time. I dont really mean to say what you are doing is wrong, because I too with my son thought it wouldnt hurt if every now and then my son would hop into bed with me, especially if my husband was away at work( he works out of the country). It then turned into a full time thing, and when the husband comes home....it makes it a little difficult to have "quality" time with eachother. After realizing how difficult it is to sleep between my husband and my 3 year old, I decided that this definately had to stop! So after weeks of fighting with my son in the middle of the night and lots of sleepless nights, he will now sleep in his bed full time all by himself. We do 'compromise' with him a little bit and will lay down with him in his bed for a little bit, but now with him being older and much bigger, I know for sure that I will not go back to the way it was before. Just a little food for thought.