Certified Polysomnographic Technician (CPSGT) 2025 – 400 Free Practice Questions to Pass the Exam

Sleep efficiency is a primary indicator of sleep quality measured during polysomnography because it reflects the ratio of total time spent asleep to the total time spent in bed. Higher sleep efficiency indicates better sleep quality, as it shows that a greater proportion of time in bed is spent sleeping rather than awake. This metric provides valuable insight into how well a person is able to maintain sleep once they have fallen asleep.

In contrast, while respiratory rate, degrees of sleep latency, and body temperature fluctuations can influence or provide context about sleep conditions, they are not direct measures of sleep quality. Respiratory rate is more related to respiratory function during sleep rather than subjective quality. Degrees of sleep latency indicate how long it takes for a person to fall asleep, which might inform about sleep onset but does not necessarily depict overall sleep quality. Body temperature fluctuations can affect sleep architecture, but they are not a direct measure of how restorative or restful the sleep experience is.