// multi-utility computation suite · offline · instant · precise
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health.sleep-efficiency Calculator
Calculates sleep efficiency (time asleep / time in bed × 100%) and classifies it as poor (<85%), acceptable (85–90%), or good (>90%). Sleep efficiency below 85% is the primary diagnostic criterion for insomnia disorder — it's also the target outcome of CBT-I treatment.
Inputs
Time In Bed
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Sleep Latency
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Wake Minutes
Reference formula or conversion factor shown for context.
Awakenings
Count of items or occurrences.
Results
sleep efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
total sleep time (hr)
The combined total across all inputs and components.
sleep quality
A qualitative assessment of how the result compares to the desired standard or benchmark.
sleep latency
Time from request initiation to response received. Composed of processing time, network round-trip, and queuing delay.
WASO
Reference formula or conversion factor shown for context.
target efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.