wow! He's doing fantastic if he's taking in that much breast milk already!! At my very first pedi appt which was 2 days after we left the hposital the doctor told us that she should be taking 1.5 to 2 oz. So sounds like little Aaron is a champ pulling in that much. Don't worry - he will be a cutie chunker in no time at that rate.
Also, don't worry so much about the "sleeping too much". Remember, at this newborn stage, sleep is nourishment too