This was documented by a study that compared 10 men who got 7.5 hours
of sleep per
night and 10 men who got 6 hours
of sleep per
night over the
course of 3 weeks and found that the men who slept less lost more weight than the others during the first week, but for the next two weeks their weight continued to
increase.
That's because productivity improvements, sales
increases, and even customer queue times that are reduced from initial time frames do not happen
over the
course of one
night.