The use of choir stalls (as opposed to benches) is more traditional in monasteries and collegiate churches. Monastic choir stalls are often fitted with seats that fold up when the monastics stand and fold down when they sit. Often the hinged seat will have a misericord (small wooden seat) on the underside on which he can lean while standing during the long services. The upper part of the monk's stall is so shaped as to provide a headrest while sitting, and arm rests when standing. Monasteries will often have strict rules as to when the monastics may sit and when they must stand during the services.