The percentage of my life spent asleep as it has changed over the last year. Down roughly from 29% (about 6 hours 58 minutes per night) to about 26% (about 6 hours 14 minutes per night) over the course of the last 365.242 days. The best was last December when I hit about 30% (about 7 hours 12 minutes per night) and the worst was in early November when I was at about 25.5% (about 6 hours 7 minutes per night). Those are of course from the general trend lines, as you can see, some specific data points have been significantly higher or lower than those trends. The data points themselves are not single nights, but rather represent daily samples of the trailing seven days.

Anyway, I thought it was an interesting chart. :-)