Sleep Consistency Score Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 28, 2026Sleep Consistency Score Calculator
Total sleep duration isn't the whole story - this calculator scores how consistent your sleep schedule actually is night to night.
Average Variance = (Bedtime Variance + Wake Time Variance) / 2
Consistency Score = max(0, 100 - (Average Variance x 1.5))
Example
15-minute bedtime variance, 10-minute wake time variance:
Average Variance = 12 minutes → 81/100 - Good consistency
Why Consistency Matters Almost as Much as Duration
Sleep consistency - going to bed and waking up at similar times each day, including weekends - is increasingly highlighted by sleep researchers as being nearly as important as total sleep duration for overall sleep quality and daytime alertness.
The "Social Jet Lag" Problem
Large swings between weekday and weekend sleep timing (commonly called "social jet lag") can produce grogginess and disrupted sleep quality similar to actual jet lag from travel, even without crossing any time zones - keeping weekend variance closer to weekday timing is a widely recommended fix.