Thank you for the description of cognitive vs. physical exertion. I will definitely try to log this myself. It plays into the 'spoons theory' which is described on Google. I was thinking of this concept as I was definitely pushing my limits today - I had to get projects turned in before spring break. I was cooking dinner at the stove and all of a sudden had a near syncope experience and had to sit on the floor. Emotionally stressful events also take me out for 24 hours. I appreciate you posting as I was also a very active person before all of this happened. This is quite the humbling experience.