a record of a person's sleep pattern, breathing, heart activity, and limb movements during sleep. Abbreviation: PSG

poly- + Latin somn(um) sleep + -o- + -gram1; for sense of poly-, cf. polygraph

polysomnography [pol-ee-som-nog-ruh-fee, -suhm-] , noun
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polysomnogram pol·y·som·no·gram (pŏl'ē-sŏm'nə-grām')
The record obtained in polysomnography.

The American Heritage® Stedman's Medical Dictionary
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