How much sleep do you need?
Studies show that the lacuna between getting just enough sleep and getting too little sleep may impact your mood, your health, your weight and even your sex life.
Mar 10, 2016, 12:41 PM IST
Relax! No day nap or eight-hour sleep for our ancestors either
One myth dispelled by the results is that in earlier eras people went to bed at sundown. The subjects of the study stayed awake an average of three hours and 20 minutes after sunset.