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.
A. Voles are often confused with both mice and moles, but have distinct habits that distinguish them from both. Voles do not hibernate and are diurnal (active during the day). They have smaller eyes, smaller ears and shorter tails than mice.