Well, I believe that human brains are but super, super, superior advanced computers. They are incredible, but that does not mean they won't "hang" or freeze when made to process excessive data without rest.
Even legs in an ocean cannot be able to keep them working when they decide to take a rest.
Good luck students. And as they say, "Mchuma juani, hulia kivulini". Or better still, "Mweka miguu majini,..." you know that proverb?