How much sleep do you really need?

Ask people whether they would like more sleep and the majority will say yes.

But does this mean they are not getting enough? I don't believe so.

Thanks to oft-repeated assertions that our ancestors slept longer than we did, not to mention claims that a lack of shut-eye can cause high blood pressure, diabetes and obesity, and it's easy to see why we think we are chronically deprived of sleep.

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