How is sleep efficiency calculated?

How is sleep efficiency calculated?

• A. Total Sleep Time divided by Time in Bed, multiplied by 100%
• B. Total Sleep Time multiplied by Time in Bed, divided by 100%
• C. Total Sleep Time divided by Time in Bed, multiplied by 100%
• D. Total Sleep Time divided by 100%

Answer: (C)

Sleep efficiency shows how much of the time you’re in bed actually spent asleep, expressed as a percentage. It’s calculated by taking the Total Sleep Time, dividing it by the Time in Bed, and then multiplying by 100. In other words, SE = (Total Sleep Time / Time in Bed) × 100. Use consistent units (minutes or hours) for both times so the ratio is meaningful, and the 100 converts the fraction into a percent. If you slept 7 hours in 8 hours in bed, the sleep efficiency would be (7/8) × 100 = 87.5%. Options that multiply the two times or divide by 100 without using Time in Bed don’t reflect the actual proportion of time spent asleep in bed.

Sleep efficiency shows how much of the time you’re in bed actually spent asleep, expressed as a percentage. It’s calculated by taking the Total Sleep Time, dividing it by the Time in Bed, and then multiplying by 100.

In other words, SE = (Total Sleep Time / Time in Bed) × 100. Use consistent units (minutes or hours) for both times so the ratio is meaningful, and the 100 converts the fraction into a percent.

If you slept 7 hours in 8 hours in bed, the sleep efficiency would be (7/8) × 100 = 87.5%. Options that multiply the two times or divide by 100 without using Time in Bed don’t reflect the actual proportion of time spent asleep in bed.