Extending your point, I think all of these subjective thought experiments on being tired are maybe useful for the person engaging in them.
People are so different for a myriad of ways that I don’t see how many of these ideas are generalizable.
Even being the same person but having different sugar and caffeine habits can dramatically change your energy level throughout the day. Without caffeine and sugar I have steady level of energy throughout the day. With sugar and caffeine I have peaks and valleys. It’s why I haven’t had soda since 2013.
People are so different for a myriad of ways that I don’t see how many of these ideas are generalizable.
Even being the same person but having different sugar and caffeine habits can dramatically change your energy level throughout the day. Without caffeine and sugar I have steady level of energy throughout the day. With sugar and caffeine I have peaks and valleys. It’s why I haven’t had soda since 2013.