When does it get dark in the dog days?

It gets dark at eight in dog days. It usually doesn't get dark until after eight in the dog days. It's too hot to get dark, and people sleep very late in dog days. They also sleep late in the dog days, and it's too late to eat, so that everyone has no appetite. It's too hot to eat and sleep in after dark. It's too cold in the dog days, and people go out for a run after sunset. It's too hot to reveal the lochia, and it usually gets dark after eight o'clock in the dog days.