BUSINESS
02/02/2014 07:13 am ET Updated Feb 02, 2014

Get Some Sleep, And Wake Up The G.D.P. - NYTimes.com

Martin Barraud via Getty Images

January is always a good month for behavioral economics: Few things illustrate self-control as vividly as New Year’s resolutions. February is even better, though, because it lets us study why so many of those resolutions are broken.

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