How Much of Your Life Is Sleep?
Plug in your age, expected lifespan, and average hours per night — we'll turn the abstract "a third of your life" into actual years and nights.
— years asleep
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What this is for
These numbers are big on purpose. The 7-9 hours per night that feel optional add up across a life. Sleeping one hour less a night is roughly three fewer years of sleep across an 80-year lifespan — and the research is clear that those hours buy you cardiovascular health, memory, immune function, and emotional regulation. They're not lost time.