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BBC - Future - How extreme isolation warps the mind
Tue Jul 30 12:15:53 2019 - permalink -"Since then, researchers have found that in darkness most people eventually adjust to a 48-hour cycle: 36 hours of activity followed by 12 hours of sleep. The reasons are still unclear."
- http://www.bbc.com/future/story/20140514-how-extreme-isolation-warps-minds