No, really. Don't be so happy about being un-burnt-out that you get excited, work too much, and then burn out again; be happy and rest. Resssssssst. Rest now. For a couple hours. And then you can get up and test like the bloody blazes - but right now, The Pillow Is Your Friend.
Someday I'm going to learn this. Someday. Tonight, I sleep unwillingly, briefly, exhaustedly, and happy.