NO way hun.... If they are sleeping well, gaining weight well, feeding regularly and are generally healthy why on earth would you wake a sleeping baby? Izzy did the same and James sleeps 12-13 hours most nights and has done so since he was 3 weeks old. Unless there is some medical reason or if bub is not gaining weight I totally disagree. James feeds 2-4 hourly after his massive sleep, some days 2 some days even 5, I feed him on demand and he is thriving. Have you had an issues with weight gain etc?? As PP said - go with your instincts hun - if he needed a feed he would ask for it.