We were on POW Island last Spring and the conventional wisdom was to head out to glass the grass flats in the late afternoon. Not being able to stand hanging around camp, we started going out earlier and earlier. We found the bears already out when we arrived, up to about 10 AM (temps were in the 70s, but it was brutally hot in the sun), and then out again about 2 PM. I've been on 2 baited hunts in Canada where the guides put us out only in the afternoon (3-4 PM), as they rebaited in the morning. Apparently it was quite common to find bears on the baits in the morning. So YES, hunt the mornings!