What if there really is just one person in the universe at a time, and the idea that there are a multiplicity of people is just an illusion? The one person who truly exists is faster than the proverbial speeding bullet, darting around from mind to mind experiencing things from one point of view, then another, for an infinitesimal moment, then jumping into another point of view, but doing it so fast that each mind thinks itself experiencing time in a continuous unbroken flow, which creates the illusion of an individual identity. Like watching a movie with discrete frames, each individual consciousness is only experiencing individual moments.
This may not be a complete fantasy; physicist Paul Davies proposes it in his book About Time as a plausible explanation of what really is. If so, then One is truly the loneliest number, and God is a restless creator in an empty universe.