Sleep Efficiency Calculator 🛏️

How to read the number

• ≥ 85%: Healthy. Most of your time in bed is spent actually sleeping — the "bed = sleep" association is doing fine.
• 80–85%: Borderline. An occasional night like this is nothing to worry about; if you're under stress, take care of your days first.
• < 80% (for weeks on end): Too much awake-time in bed. This is exactly what CBT-I targets — and note, the fix is usually not going to bed earlier. It's the opposite.

What is sleep efficiency?

Sleep efficiency = time actually asleep ÷ total time in bed × 100%. It is one of the core metrics in Cognitive Behavioral Therapy for Insomnia (CBT-I). As a rule of thumb, 85% or above is considered healthy; staying below 80% for weeks suggests the association between "bed" and "sleep" may be weakening.

Why does spending longer in bed make sleep worse?

Many people with insomnia go to bed earlier to "catch up." But the longer you lie in bed awake, the more your brain pairs "bed" with "wakefulness and worry" — a conditioned association. CBT-I techniques like stimulus control and sleep restriction work precisely by compressing time in bed and rebuilding the bed = sleep link.

When to seek professional help

If poor sleep happens 3+ nights a week, has lasted over 3 months, and clearly affects your days, that fits the pattern of chronic insomnia and is worth a visit to a sleep clinic or a mental-health professional. CBT-I is the first-line treatment recommended by clinical guidelines worldwide — effective and medication-free — but it should be done with professional guidance.

⚠️ This calculator is a science demo: single-night numbers fluctuate a lot (clinics use 1–2 week diaries), and nothing here is a diagnosis or treatment advice. If your mood is clearly suffering, see crisis resources.