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.
Rat & Mouse Noises in the Home. The most common complaints associated with rats and mice are the scratching noises heard in walls or ceilings. Rodents will make the most noise during the night when they are searching for food and during the cold winter nights when they are searching for shelter. Critter Control can help keep rodents out of your home by trapping the rats and mice within the home, identifying their entry points and sealing off these holes.