[Rutting Elephant]

I had a spy manual when I was a little kid, with tips for invisible ink (lemon juice) and other stupid stuff. But one piece of advice seemed to work, and I can remember it almost verbatim:
When you wake up, extend your arms and legs up into the air and hold for thirty seconds. This will make your entire body completely alert.

Edit: This also works on girls one is trying to activate, for eviction etc.