But sleeping less than seven to nine hours per night has some serious health consequences.
Of course, getting more and better sleep tonight plays a major role in better energy levels tomorrow.
This included twins as well as unrelated adults so they could estimate the impact of genetics on the results.
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More surprising, though, were the other revelations after crunching the numbers from the two-week info-gathering session.
Genetic factors appeared to have a very minor impact on alertness levelsfar less than activity, sleep and diet.
Plus it doesn’t feel all that great to walk around dragging all day!
