If this video is only half true, it is something people need to seriously think about. When I was young I was always sleep deprived, but these days, my body makes me take extra naps. Probably too late to fix the damage that has been done.
https://www.youtube.com/watch?v=pbJxLITdt_E&feature=youtu.be
https://www.youtube.com/watch?v=pbJxLITdt_E&feature=youtu.be