— polysomnography /pol'ee som nog"reuh fee, -seuhm-/ , n.
/pol'ee som"neuh gram'/ , n.
a record of a person's sleep pattern, breathing, heart activity, and limb movements during sleep. Abbr.: PSG
[ POLY- + L somn ( um ) sleep + -O- + -GRAM 1 ; for sense of POLY-, cf. POLYGRAPH ]