Sleep Efficiency Calculator
Actual sleep time as a percentage of time in bed — the standard sleep-medicine metric.
A general wellness indicator, not a diagnosis. Persistent low sleep efficiency is worth discussing with a doctor, especially alongside daytime symptoms like fatigue.
Sleep efficiency
87.5%
Good
For informational and educational purposes only — not medical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why time in bed matters as much as hours slept
Sleep efficiency measures what fraction of the time spent in bed was actually spent asleep — lying awake for an hour before falling asleep, or awake during the night, lowers efficiency even if total sleep time stays the same. 85% or higher is the commonly cited threshold for good sleep efficiency, and it's the specific target used in CBT-I (cognitive behavioral therapy for insomnia) sleep-restriction protocols, which deliberately limit time in bed to consolidate and improve the quality of the sleep that does happen.
Frequently asked questions
What's considered a good sleep efficiency percentage?
85% or higher is generally considered good sleep efficiency in sleep medicine — meaning 85%+ of your time in bed is actually spent asleep. Consistently lower numbers can be a sign of insomnia or other sleep disruption worth discussing with a doctor.
How is sleep efficiency calculated?
Total time actually asleep divided by total time spent in bed, expressed as a percentage — so lying awake for 30 minutes before falling asleep, or waking up repeatedly during the night, lowers the score even if your total sleep duration looks adequate.