[lujim]

Also probably fair to include burnout, chronic-fatigue/post-viral/long-covid, moderate to clinical depression, anhedonia, cardiac problems, auto immune diseases. Tired and fatigued are also super different. Sleepy vs tired, wired, and lacking the capacity to physically function effectively.

Growth = stress + rest. When physical or mental stress outpace rest you will get tired. The intensity and duration being the big differentiator.