There was a planet which through a combination of astonishing astronomical circumstances experienced a total eclipse lasting for several days. As a consequence every living thing eventually happened to be asleep at the same time, and from this sleep noone was ever to awaken. Reality needed to exist in the mind of someone and when the last exhausted mind disappeared into the calming oblivion of sleep, reality disappeared with him. There being no reality into which anyone could awaken, noone could awake.
I suppose I could have an alien visitation to the planet and with reality having a mind within which it could exist, everyone awakens- a variation on the Sleeping Beauty tale. Or ponder a collective dreamworld evolving in the minds of the sleeping populations. And perhaps within that dreamworld the given scenario could occur.
I could also hint at the scenario being an analogy to the vision of Huxley's Brave New World parable-prophecy.