In this speculative fiction, Somnus is an inflatable device worn on the head. It is equipped with LEDs, air pumps, peltier coolers/heaters, and bone conduction transducers, which work in concert to induce synchronized, lucid dreaming between two or more people.

Though the world-building is speculative, the technology is based on current research surrounding lucid dreaming. Wearers choose dreams to “join” each night and are able to connect with others through synchronization while they sleep.