6 hours sleep vs fortnight

In the morning I read an interesting article written in Japanese, from a link on Niconico Douga.

Lack of sleep a little bit looks like as bad as fortnight - In the experiment on the article, people are divided into 3 groups, with 8 hours sleep, 6 hours sleep, and no sleep at all. Then people in each group looked like to take a test to check concentration, and 6 hour sleep group performed as badly as fortnight group.

I'm surprised that how lack of sleep to a small extent unexpectedly affect my health.
My sleep daily is 6 to 7 hours a day although more than 8 hours is desirable.

Of course I won't take a choice to get myself into fortnight group because slight shortage of sleep may be as bad as fortnight, but I would like to have enough sleep, managing my schedule, and making my daily post brief.

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