[@The Grey Dust]
I assumed you meant the moon would be a defence since it is almost permanently illuminated by the sun. It has a single side that's almost always bright, and a single side that's almost always dark. Night and day there are geographic locations there. As such, one could remain in the sunny area and be safe (most of the time).

However, within the space station with the power off there would be almost no light. I assumed Bedivere's power was tied in to darkness, rather than 'day', as 'day' is just a name given to a particular span of time in which there happens to be more light. As you said, these concepts become meaningless in space. So would Bedivere exist in some quantum state in between two vastly different states of matter, as a wave function of all possible Bediveres?