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Naps are good, has been my motto for many years.
In Spain and the Carribbean, time for a midday nap is built into the culture, to work around the midday heat.
However, they also have longer days in order to make the most of cooler mornings and evenings.
The study needs to look into that as well.
@rdaily I took a nap today! A few back-to-back nights of less than 8-hours takes its toll.