People aren't home Saturday, they're out because they don't have work and can stay out. They're almost always home Sunday nights, because of work the next morning.
And not everyone gets off weekends and unless you work in restaurants, Sundays are the slowest business day so you'll be off or have a short day/ close early. Any buisness hours you look up are open later Saturday and close early Sunday. Same idea.
Ever notice how Saturday TV is God awful? This is why.