What is the definition or description of: sundowning?

Confusion at dusk: Patients, especially the elderly are more vunerable to this, particularly if they are on chronic pain medication. Typically they are fine during the day, perhaps some confusion. One way to help is to keep a night light on when sleeping. Constant orientation by nursing staff i.e. Remind the patient where they are, checking on them at night and giving reassurance also helpl.