I started doing the dark-to-dark vigils a couple years ago. While I DID see deer in the middle of the day, I still saw the most activity in the early morning and late afternoon periods.

This year, it's been so dang warm here that the deer are only moving in the first or last 1/2 hour of daylight. I've sat from dark to after 1pm this week and saw nothing once it warmed up. If it would cool off, that would help, but the 10 day forecast show more of the same.