Brain efforts

Human brain is something quite interesting, especially its reactions when it's overloaded with lots of different types of information which it cannot process simultaneously. One tries to push it to its limits in the ordinary way. And the result is far more negative than even expected.
In the very beginning you feel temporary exhaustion and a constant demand for sleep. When you move, you concentrate your energy into the movement and the brain feels more relaxed.
After some rest as if everything is back to normal, but that's only the surface. Beneath it the brain still lacks a complete rest and the exhaustion is accumulated hour by hour, day by day, week by week.
The reactions become hasty, the emotions swing from one edge to another. One day you might be full of energy and concentration, to be excited to the maximum and feel love and attachment to every lviing creature. On the other day you might fall into a deep depression, thinking that the whole world is against you.
The final phase includes all previous phases but also total lack of concentration, forgetting things and also a feeling that some real moments have actually never happenned.
That's the break-even point which marks the moment when serious measures should be taken. Like taking some days off and changing the environment. Brain loves diversity.