It would not be very comfortable to sleep strapped to the bed in a strange position. Sleeping in sitting position does not count as comfortable. At most you can

It would not be very comfortable to sleep strapped to the bed in a strange position. Sleeping in sitting position does not count as comfortable. At most you can count on sleeping like in an airplane. Self-driving car can't beat physics. In case of an accident everything inside will fly continuing direction of movement. Including the passenger. There will be no two couches facing a table. Because in case of an accident the face of a passenger sitting facing the back of the car will be hit with: his book, his hot coffee and opposite sitting passenger's laptop.