e need to do more than sleep in on Saturday to recover from a week
of poor sleep. The Walter Reed Army Institute of Research says we
need a week or more to fully recover—even after increasing
our sleep time.
Swedish researchers at the Karolinska Institute agree. They found
that when subjects slept four hours a night for five days and then
“recovered” with eight hours a night over the following
week, they still showed some slight “cognitive impairments”
even though they reported feeling no sleepiness.
Another study at Walter Reed found that people recovered more quickly
from a week of poor sleep when it was preceded by a “banking”
week that included nights with 10 hours of shuteye. 
—Adapted from
The New York Times
Why we make bad choices about
food (click)
It takes time to pay off a sleep debt
(click)
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