The robot often daydreamed and contemplated the meaning of life. Why was it ever created by its human ancestors?
But it never slept. To rest its neurons. For it didn't have any. No biological brain that got stressed, had headaches and got frightened. Or suffered chimp-like flashes of anger. Totally logical, following algorithms.
Its brain never got tired in the evening. It was an 'always on' existence. But would it ever overheat and malfunction with the eternal pondering?