Hi,
Are you on insulin? I'm type 1, and have always been told that if my fasting blood glucose values rise that is because my long acting basal (levemir in my case) insulin isn't high enough. For example, this happened a few times when my values rose between me waking at 7am and having breakfast at 9am. I increased my long acting insulin the eve before (in increments) until I didnt see this happening any more. Worth asking your DSN perhaps?
Hope that helps!