I can function fine on less.

Functioning is not the same as thriving. Sleep deprivation builds up, and many cognitive costs only show up in long-term memory and immune function.

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Sleep Need by Age

Recommended hours of sleep per night by age bracket, based on the NSF consensus and recent meta-analyses.

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Age (years)

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I can function fine on less.: Functioning is not the same as thriving. Sleep deprivation builds up, and many cognitive costs only show up in long-term memory and immune function.