As it turns out, “polyphasic sleep” or “segmented sleep” is a well-renowned concept in sleep psychiatry. Polyphasic sleep is the practice of sleeping in multiple smaller segments during the day as opposed to sleeping once as is common in many countries. Apart from Dickens, some of the most eminent personalities in history used to have this habit, including Thomas Edison, Nikola Tesla, Napoleon Bonaparte, Salvador Dali, Benjamin Franklin, and even Albert Einstein. good.is/medieval-sleep-ro..