I have to agree with Taylor 01...
I think this new procedure being implemented is a knee jerk reaction to a bunch of ASR's and possibly not vey well thought out. Switching call sign's, or should i say "tweaking" call signs at midnight is not, in my opinion a wise choice. I don't think we'll be any better off. Call signs will be missed and confusion will still exist.
Fatigue will play a part no matter what you want to call yourself. A tired pilot is a tired pilot.
I'm not sure what the solution should be.... But I can't say I'm convinced this is one of them.
Just my 2 cents...