Another way to waste my time

Or is it really a way to spend dead time more efficiently? Or is it just plain fun?

I bought a Nintendo DS Lite recently and I love it. I've mostly been playing New Super Mario Bros. (which mostly combines the best of Super Mario Bros. 3 and Super Mario World into an entirely new game). I am also considering picking up Brain Age and Big Brain Academy to keep my mind sharp. No one puzzle in either of these games is that hard, but the fun and the challenge come from trying to do the puzzles as quickly as possible.

Arguably my favorite aspect of the DS is the sleep function. Whenever I am playing Mario, I can just close the system at any juncture and the system will go into a very efficient energy-conserving sleep mode. Then, as soon as I open it back up, I will be EXACTLY where I was when I closed the system. I can just dive right back in. Brilliant!