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.
(Itâs important to keep in mind that this kind of sleep experimentation doesnât necessarily work on a weekend. Dr. Watson points out, âThe first few nights â¦ you may sleep eight to nine hours if youâve been extra tired or sleep deprived from the week.â).