I can empathise and think I'm coming to join your side of the world shortly. Friday night I slept close to 11 hours, Saturday a bit less and last night I had a migraine and really just couldn't sleep. I got close to only 5 hours of sleep. Yet I feel OK this morning. I never make lunch for work (it's so much easier to just buy at the canteen) but I was up and busy making my own lunch this morning. Driving to work I was turning the music up, listening to serious house music... this is just not the normal controlled me, so I'm sure I'm entering a manic phase.
I think the important part is to channel this extra energy into a useful path - maybe start taking up running?