Unsteady on your feet? Why sleep deprivation is ruining your walk

From obesity to heart disease, there are many harmful effects of a lack of sleep. Now scientists are adding an unexpected one to the list: a wobbly gait

Name: Sleep deprivation.

Age: Dates to somewhere around the early 19th century. Before that, nobody knew how much sleep they were supposed to get, so they didn't feel deprived.