For me there are (atleast) two different types of fatigue. The two are closely related and have only a few differences but those cause a very unique physical experience in each case.

  • Physical Fatigue: Basically, what you feel after being out all night on a saturday night. It does not involve any degree of stress but there is a real heaviness and need to sleep for a very long time. One feels detached and pensive towards their surroundings.
  • Emotional Fatigue: Is created when one retains a great deal of stress from their day. Can also be caused by the aftermath of a great deal of anxiety or other strong negative emotion. A headache or muscle tension may be present. The need to sleep is even more intense then with physical fatigue. The ability to reason is impaired and one will sleep a half-sleep such that the mind is resting and the body is merely going through the motions.