I have shot coyotes all hours of the day and night over a bait pile. If you can establish a place and keep it stocked with all manner of dead animals the coyotes will soon forget about timing. Many come in the morning, but not necessarily that early. Depending on what is going on, like on a dairy farm, they like to come when the chores are done and everyone, including the farm dogs, are in having coffee. They are also very fond of coming in just after dark.