Scott stirred in his sleep. Without awakening, he called what was obviously a question, though it did not seem to be in any particular language. Emma gave a little mewling cry that changed pitch sharply.
She had not awakened. The children lay without stirring.
But Paradine thought, with a sudden sickness in his middle, it was exactly as though Scott had asked Emma something, and she had replied.
Had their minds changed so that even — sleep — was different to them?

Mimsy Were The Borogoves (1943)