im no good at diet stuff, but ill try and answer till someoen better comes...
i feel tired on days i DONT do cardio...once i do my cardio or lift i feel good after that, but before that i feel nausiated and sick and have a headache...so no, cardio makes me feel awsome, not tired (after the initial cardio induced tiredness goes away).
lots of people say having casein cause its slow digesting before bed so your stomach feeds and works while ur sleeping....but unless your sleeping less than 4 hours or whatever, everything would pretty much be digested...
but anyway *BUMP* for someone who actually knows