Looking at all of these charts, I can see a pattern of sightings starting to increase at the onset of sunset, and decrease at the onset of sunrise, as they change throughout the months. Each month, sightings start to increase later and later until around nine o'clock, or so, then start getting earlier and earlier again. To me this makes sense due to the overall nocturnal nature of this creature. It's going to wake up and start moving around at sunset and go to ground mostly around sunrise. Of course, since Bigfoot is not strictly a night-time creature, there are quite a few sightings that seem to point to the opposite. A creature that gets up at sunrise, and goes to bed at sunset. We humans are, for the most part, the opposite of that. The majority of us sleep at night, and move around during daylight hours, but a handful of us sleep all day and move around at night. Not just because of work, either. Some people are actually wired to be active at night, and rest during the day.