They make up a scant 1% to 3% of the population. There isn’t much data on these short sleepers, in part because they’re hard to find; they don’t typically seek treatment, since they don’t think of their sleep habits as unusual or disordered.
What the few researchers studying the phenomenon have figured out to date is that naturally short sleepers routinely get six hours or less a night and function well, without being tired. They tend to be upbeat, optimistic and outgoing. They are high-energy multitaskers. Sometimes short sleeping begins in childhood and runs in families