Sleeping Disorder

Well My 4 year old son Jared is always up and it seems I can never get him to sleep before 1 or 2am, even if he doesn't take a nap he just doesn't sleep at night. Tuesday night I went to sleep early because I didn't feel good Brandon said he would try to get him to lay down. Brandon comes in to bed at about 11pm and says,'' I think Jared has a sleeping disorder.'' My heart started pounding, not really what I wanted to hear knowing if I take him to the doctor they are just going to put him on sleeping pills and I don't want my son started on those and depending on them to sleep so i probably will take him to the doctor just to see what he thinks. If anyone knows what to do about this please give me some ideas