> Sleep is a whole-body process of repair and optimization. This is what I felt when I watched the Netflix documentary "My Octopus Teacher". At some point, th

> Sleep is a whole-body process of repair and optimization. This is what I felt when I watched the Netflix documentary "My Octopus Teacher". At some point, the octopus was vigorously attacked by a shark, which cost her a tentacle. She was bleeding and retreated to her den. The attack made her very weak. She could no more change colors, nor get out of the den, even to get food. After a week or so in the den, presumably sleeping, she started recovering and her arm started to regenerate.