1) Psg 
A group of recordings taken during sleep that shows brain wave changes, eye movements, breathing rate, blood pressure, heart rate, and the electrical activity of the heart and other muscles. A polysomnogram may be used to help diagnose sleep disorders.
The recorded physiologic function(s) obtained in polysomnography. ... Origin: poly-+ L. Somnus, sleep, + G. Gramma, diagram ... (05 Mar 2000) ... 
Type: Term Pronunciation: pol′ē-som′nō-gram Definitions: 1. The recorded physiologic function(s) obtained in polysomnography.
polysomnogram The recorded physiological function(s) obtained from polysomnography.