Don't eat high sugar items.

Try some fruit, cereals like oatmeal, or something but breakfast is very important especially during a workout regiment.

Just imagine it this way....if you went 12 hours during your normal day without eating how would you feel? Sleeping slows the bodies processes down but it does not stop them, so when you wake up you need fuel for your body to burn or it begins cannibalizing itself. The first thing the body begins using is muscle and not fat (contrary to popular opinion) which basically means you are working against yourself by not keeping your body fed well.