I have two sons who are nine and twelve and my oldest son did have an imaginary friend, Ben, for a couple of years when he was pretty young. I think that Ben left our lives about the time that my son went off to kindergarten. I had similar questions at the time and I was told that he would probably grow out of it by elementary school. Sounds like your son is still clinging to his friend. My guess is that this is unusual. Does your son have "real" friends? Does anyone at school know about him? I think you are asking all the right questions. Keep at it!

I know adults that still get nightmares so whether or not it is normal is not really the issue.  The question is, what are the underlying causes? Nightmares are often caused by external anxieties about something.  You should talk to him about his nightmares and look for a common theme.

i don't think it's abnormal, although my mom thinks so too. I'm 14, turning 15 in a few months and I "created" an "imaginary" friend last year/school year due to none of my friends understanding my way of thinking. I think it's because of school issues, maybe he's being forced into something he really doesn't want to do? Maybe he's lonely? Maybe he doesn't have enough time to hang out/play with his friends? Maybe his friends are shunning him? Maybe he's like me and no one understands him? There are a lot of possibilities, but it most certainly is not abnormal, cause I know I am very sane if I am getting an A in my English Honors class and have not gone loony yet.