I suspect many people regularly get their requisite amount of sleep through two or more sleeping sessions per day, perhaps a night time sleep and a daytime nap.
Reporting just their night time sleep seems to give a scary small number of hours of sleep per day, but the nap brings the total up to a normal amount.
Also occasional days getting more sleep. Outliers affect the mean quite a bit.
It's interesting that the body's circadian rhythm can adapt to such a sleep schedule.
Spanish culture had notably given us the word siesta.
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