Grand jury is so named because traditionally it has greater number of jurors than trial jury, called a petit jury (from the French word petit meaning small).
Although mice tend to come out in the night when most of the occupants of the house are asleep or immobile. This allows them to stealthily infiltrate any of your food bags, crumbs etc. During the day time, mice will normally not come out, but if opportunities exist then they surely can.
Cheetah hunt during the day in an attempt to avoid competition from nocturnal predators like lions and leopard. However, their smaller size and less aggressive nature makes it difficult for them to defend their kill, and they often lose their meal to other cats or opportunistic scavengers.