I also only really experience hypomania. I start talking fast and animated and I also become a more aggressive driver. Music triggers me into a GREAT mood. More recently, my bf has told me I need to slow down- that's a biggie for me.
I also don't get tired in the evenings close to when I ought to be going to sleep. I then usually have to read or do Soduko to fall asleep. At work I cannot concentrate on a project and am always striking up conversation with colleagues