Comment by pdfernhout

Not suggesting anyone try this but some people claim to sleep only two hours a day with this approach: https://www.sleepfoundation.org/how-sleep-works/polyphasic-s... "Uberman Sleep Schedule: Six 20-minute naps are spaced evenly throughout the day, totaling two hours of sleep per 24-hour period."

A book on sleep and how important it is to learning and health: https://en.wikipedia.org/wiki/Why_We_Sleep "Walker spent four years writing the book, in which he asserts that sleep deprivation is linked to numerous fatal diseases, including dementia. ... The values of sleep and the consequences of sleep deprivation are also brought up in the book. One particular research conducted in the past, where people volunteered themselves to sleep for only six hours in a span of 10 nights, is brought up by Walker. This resulted in the volunteers being "cognitively impaired" along with their brains being heavily damaged, regardless of the three week eight-hour sleep schedule they received later."