请根据以下有关问题写一段英文

I don't often feel tired for generally I am a very energetic person. However when I have worked very intensively over multi tasks for the whole day without any breaks in between, I will normally feel very tired after I get home, in fact I would call myself being completed drained at that stage. This tiredness usually comes from hours of constant strain of high level of concentration. It makes sense that I feel tired, when a rubber band has been stretched to the extreme for a long period of time, after it's all of a sudden released it'll be much loosened than before, same applies to human being, after under intensive pressure for a long period of time, anyone would feel snapped easily.
In terms of category of fatigue, I can think of three kinds on top of my mind, one is the above mentioned, a tiredness after strain of the brain, one is a physical relief after long hours of physical labour, that's a signal my body will send to my brain that every single muscle of