There are different kinds of fatigue though. When I go running, it's some kind of aerobic sensation, but eventually my thoughts shift when it's time to stop.

There are different kinds of fatigue though. When I go running, it's some kind of aerobic sensation, but eventually my thoughts shift when it's time to stop. If I lift heavy things for an hour, I can also be quite winded but there's usually some gas left in the tank I just know it's better to get some rest and allow muscle to repair. Some kind of crossfit style workout, yet another sensation. Sometimes I can take a nap as soon as I get home after the above, especially a vigorous run in the Arizona desert during summer. Knowledge work has its own fatigue for me. If I go deep into flow state while working on something, eventually I reach a generalized mental haziness, where I want to relax and let my mind wander or be passively entertained. Usually I have trouble sleeping after intense thinking, mind still firing but not effectively. I just want to "chill" and watch TV or do something simple and rewarding like clean the house to try and bring it fully out of gear.