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Polysomnography Technician

Real-Life Activities

Real-Life Math -- Solution

How many EPOCHs were recorded between Time Zero and lights on?

From 10 p.m. to 7 a.m. is 9 hours.
1 minute = 2 EPOCHs
60 minutes per hour x 2 EPOCHs per minute = 120 EPOCHs per hour
9 hours x 120 EPOCHs per hour = 1,080 EPOCHs

Using EPOCHs, what is your patient's sleep efficiency?

Time Zero to falling asleep = 75 minutes
75 x 2 = 150 EPOCHs

Nighttime awake period = 21 minutes
21 x 2 = 42 EPOCHs

Time from morning wakeup until lights on = 80 minutes
80 x 2 = 160 EPOCHs

Total time awake: 150 + 42 + 160 = 352 EPOCHs
Total sleep time: 1,080 - 352 = 728 EPOCHs

Sleep efficiency: 728 / 1,080 x 100 = 67 percent

The patient's sleep efficiency is 67 percent. Ninety percent would be considered normal.

"We are always talking about how many hours somebody slept to the closest 30 seconds, how much time they spent in certain stages of sleep, what their sleep efficiency is," said Laree Fordyce, a polysomnography technician. "In many clinics, the computer calculates the numbers, but not in all clinics."


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