I have been changing routine to get some more exercise recently... I've started sailing again. The general routine is work the morning, sail the afternoon, sleep damn early (8:30PM?), wake up 2AM, work awhile, sleep again about 5AM, wake again about 8AM, eat, rinse, repeat.

Yesterday I woke up early for a cancelled meeting, which broke my pattern. As a result, I sailed too early and too long .. and slept right through. This morning three dogs woke me up, apparently they were having sex. I have no doubt they will sleep again :)