Lifetime sleep hours
About a third of life is spent asleep. Here is your share so far, in years, nights and sleep cycles.
Your details
Years asleep so far
12.5 years
31% of your life, about 14,610 nights
- Sleep still aheadabout 13.7 years
- Sleep cycles a night5.0 of about 90 minutes
- Adult guide7 to 9 hours: you are in it
Children sleep much more than adults, so years asleep so far are an estimate at today's hours. Time asleep is not wasted: it is when your body repairs and your memory sorts itself out.
See a GP if poor sleep has lasted months or leaves you struggling in the day.
The working
Age 40, 7.5 hours a night
7.5 hours is 31% of a day, so 40 years includes 12.5 years asleep, over 14,610 nights. With 43.9 years ahead on average for a woman of 40, there are about 13.7 more years of sleep to come.
How much sleep
NHS guide for adults
Most adults need 7 to 9 hours a night. Children need much more: 9 to 12 hours for ages 6 to 12, and babies up to 16 hours with naps.
Sleep cycles
About 90 minutes each
A night is made of cycles of light, deep and dream (REM) sleep, each around 90 minutes. Five cycles is about 7.5 hours, which is why some people wake feeling better after 7.5 hours than after 8.
Read with care
What this cannot tell you
- Count childhood sleep exactlyIt uses your adult hours for every year.
- Measure sleep qualityTime in bed is not the same as good sleep.
- Predict your lifeLife expectancy is an average.
Questions
Common questions
How many years do we sleep?
About a third of life: roughly 26 years over 80 years at 8 hours a night.
How much sleep do adults need?
7 to 9 hours for most adults, according to the NHS.
How long is a sleep cycle?
About 90 minutes on average, though it varies from about 70 to 120.
Is sleep wasted time?
No. Sleep repairs the body, consolidates memory and keeps your mood steady.
Sources
- NHS Every Mind Matters: sleep (most adults need 7 to 9 hours)
- ONS: National life tables, United Kingdom, 2022 to 2024 (period expectation of life by age and sex)
Last checked 21 October 2026. Spotted something wrong? Tell us and we will fix it.
Sleep worries
See a GP if poor sleep has lasted for months or leaves you struggling in the day, or if someone notices you stop breathing in your sleep.
Related
Related calculators
- Sleep debtWeekly sleep debt from weeknights and weekends.Open
- Teen sleep debtSchool nights, weekends and the gap.Open
- Sessions left in my lifeThe sessions still ahead of you.Open
- Children's sleep calculatorA bedtime window for your child.Open
- Sleep consistencyThe shift between work nights and nights off.Open
- Tea and hydrationTea, as hydration and bathtubs.Open