Just recently decided to take up meditation again. I've forgotten how alert I feel after it, I just enjoy sitting in one spot in a relaxed state contemplating nothing and everything.
Although contradictory its a fantastic mindset to be in. Another common way of meditation is to think about one thing or look at a spot (relax and letting your eyes blink without losing focus) and concentrate on it. It makes it easier for you to concentrate when doing work as well.
My single fact for the day. Now I'm off to race some karts ^_^