Jens,
Thanks for the explanation. From what I've read, you wouldn't switch from whey to casein, you would use both.
The whey upon waking, during the day, after working out, etc, but you would use the casein before bed. It's slower absorbing, or was that releasing, but anyway, it's spose to keep you fuller during the night, so that you won't wake up hungry in the middle of the night. You can also accomplish this by eating a shit load of cottage cheese before retiring for the night. From, what I've read it's also spose to be great for muscular gains, whatever that may or may not mean.
HTH
Necia