For whatever reasons Tuesday and Wednesday nights are always when I find myself going to bed needing to spend some voting power in order to stop it from reaching 100% overnight, and I end up dumping it into things that are marginally profitable for me (recently @socialwallet for instance) rather than spending it on excellent posts. I'm not sure if that's a quirk of the people I follow or if the sitewide content is really at its minimum on those days.