Polysomnography

Polysomnography (PSG), also known as a sleep study, is a multi-parametric test used in the study of sleep and as a diagnostic tool in sleep medicine. The test result is called a polysomnogram. The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
In Paternity, the team use a sleep study to determine that Dan, the patient they're currently treating is experiencing night terrors.
Polysomnography at Wikipedia
Category:Medical procedures‏‎