Yeah, my attention span can be very bad sometimes too. It totally depends how I'm feeling. I will literally have to stop doing something over and over again to get through it quite often. I'll often become too "excited" to actually finish what I'm doing. (not really the right word - it's pretty much impossible to explain that feeling)
Yeah. Actually I can remember way back when I was a kid I'd be reading and I'd suddenly just get stuck in one sentence and have to keep reading it over and over before it sank in and I could move on a few sentences before it would happen again. Took me ages to read a book.