You know, it's funny, out of college I was dead sure I needed 8 1/2 hours of sleep a night just to maintain. 9 was better and 7 would slowly grind me down until I ended up sick.

Now that I get more regular exercise, I need a little over 7 hours a night to maintain. And the weirdest part is that my routine works out to about 40 minutes a day including transit time. And while I spend a lot more time resting now due to post-workout fatigue, I spent a lot of time vegging before because I was 'exhausted'.

So in all, by working out I net at least an extra half hour to an hour a day where I'm awake and useful.

Interesting, what sort of exercise was it. I'm already ignorantly constructing a hypothesis of it being mindless (IMO: jogging/running, swimming) and so acting like down time for the thinking parts of your brain ...?

I should say, that none of this changed the fact that I think 9:45 is a perfectly reasonable time of day to arrive at work...