If you are going to drink a protein shake before bed, you need to make sure that it has CAESIN in it, which causes the protein slowly releases over time. If you just drink a regular WHEY protein drink, it will be absorbed within a half hour, then you will once again go into a catabolic state. This also makes whey protein shakes NOT a good choice in replace of meals. Whey is best used immediately after a workout when the muscles are damaged and can redilly absorb the aminos.