Could an afternoon nap really be better than sleeping more at night?
Daily naps are a non-negotiable part of my life. If I don’t nap by three in the afternoon, I basically can’t function and no amount of coffee can carry me. I have too much to do to live with brain fog, and napping makes me more productive. It turns out that my kindergarten-inspired habit might actually be an evidence-based strategy, though, because research has suggested that for some, implementing a nap during the day could be even more beneficial than increasing the hours you sleep at night.
A small but revealing study that dropped this past spring in the Quarterly Journal of Economics investigated the sleep habits of 452 individuals in Chennai, India who were having problems sleeping. According to the study, the participants woke up on average 31 times each night, and despite the fact that they stayed in bed for eight hours, they only averaged only five-and-a-half hours of sleep. So even though they went to bed with the intention of sleeping the whole night, they couldn’t.
Researchers call this kind of broken up sleep, “sleep fragmentation,” and the result of it is called “sleep inefficiency.” And yea, it’s not great: Chronic sleep inefficiency can lead to a host of health problems, but what the researchers were interested in was the participants' productivity. What they found was that when individuals took a short afternoon nap, their productivity went up, but when they slept a little extra at night — about 30 minutes extra, to be exact — their productivity went down.
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