Corrected entry: Calculon says in this episode that as a robot he never sleeps at night. But we have seen Bender and numerous other robots sleep on several different occasions - he even dreams about "killing all humans" when he is asleep.
Corrected entry: In this episode, it is revealed that only male robots have antennas. However, in "The Honking" (series 3), a fembot is seen crying at a funeral by pumping her antenna.
Correction: In 'Bend Her' we see that robot gender is a pretty flexible concept - "she" could be a "he", or both (or neither.).
Correction: Calculon could be a model of robot that doesn't require a "sleeping" period at night. Alternatively, it could be unnecessary for robots to sleep, but in order to conserve energy when they don't need to do anything they go into a state of low power consumption, seeing as it would probably take energy for a robot to stay turned on, and what would be the point of being turned on while all humans are asleep and unable to give the robot orders?