I discussed this with Smokepole awhile back. What I have found in my area in the Okanagon, is that the bears are hitting their water source during the night, typically feeding through late morning, laying up or traveling to new food source during the middle of the day, and feeding all afternoon and evening again. When I first started hunting there we hunted near water tanks, ponds, and troughs because it is usually so dry. We didn't kill a thing. When we targeted their food source we started seeing a lot more bears.