3 Sneaky Reasons You Wake Up Feeling Tired, According to a New Study
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. Photo: Getty Images More surprising, though, were the other revelations after crunching the numbers from the two-week info-gathering session....