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Sleep duration certainly affects the quality of sleep, but it is nowhere near a simple correlation. It is just one of many factors, and these factors don't work in isolation. Statistically speaking, it's a multivariate model - and one which includes a differential equation, because the way sleep duration affects your sleep today depends on the sleep quality ...


From experience I cannot say quality is dependent on duration. For example, you can take a 30 minute power nap and feel much more refreshed than sleeping 8 hours. It may have something to do with dehydration and hunger during the long periods of sleep that disrupt our REM sleeping, our deep-sleep.

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