1. A procedure or method of recording movements of a person while he or she is asleep: Because Susan had serious problems sleeping through the night, the doctor decided to check up on her body motions during the night, so he arranged to have a polycinematosomnography performed.
2. Etymology: from Greek polys, "many, much" + Greek  cinema, "move, motion" + Latin som, "sleep" + Greek graphein, "record, written description".