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Saru Yume: The Monkey Dream

  • Entity Name: Saru Yume
  • Category: Digital Manifestation / Memetic Hazard
  • Origin: Japanese Internet Folklore (2channel)
  • Containment Class: Euclid
  • Threat Level: 5 (Severe Psychological/Physical Trauma)
  • Alignment: Neutral
  • Tags: #MemeticHazard #JapaneseNetlore #RecursiveDream

Saru Yume, commonly translated as “The Monkey Dream,” is a potent memetic agent manifesting as a recursive, inescapable nocturnal vision. Unlike standard nightmares, which dissolve upon waking, Saru Yume functions as a trapped loop of visceral, hyper-realistic sensory input.

  • Visual Manifestation: The dream invariably begins on a train. The carriage is populated by “passengers” who appear humanoid but are subtly “off”—possessing uncanny movements and glassy, unblinking eyes.
  • The Announcement: The atmosphere is punctured by a monotonous, synthesized voice over the train’s PA system. This voice systematically narrates the gruesome, agonizing deaths of the passengers present, culminating in the impending execution of the dreamer.
  • Sensory Fidelity: The primary danger of Saru Yume is the 100% fidelity of the tactile and pain receptors. Injuries sustained—whether being skewered by mechanical apparatuses or crushed by the train’s infrastructure—are registered by the dreamer’s nervous system with absolute biological reality.

“The pain does not vanish when you wake; it is encoded. You are not just dreaming of the monkey; the monkey is dreaming of your expiration.” — Fragmented recovery from 2channel forum logs.


When the entity becomes active, the subject is bound by the following reality-distortion constraints:

  1. Deterministic Pathing: The dream cannot be altered by willpower. The train must reach its destination, and the “Monkey” entity—or its proxies—must complete the prescribed torture.
  2. Recursive Tethering: Subjects often report that even after “waking up,” they find themselves in a false awakening loop. The dream repeats, often with the brutality escalated in each successive iteration.
  3. Proximity Threshold: While the entity is memetic, data suggests a 50-meter baseline containment radius around active digital nodes (forums/image boards) where the legend is being actively disseminated.

现代异常收容改编 (Modern Anomaly Adaptation)

Section titled “现代异常收容改编 (Modern Anomaly Adaptation)”

SCP/异常世界观融合: Current status: Uncontained.

The “Monkey Dream” does not exist in a static location; it exists in the transmission of the story itself. Research suggests that reading the full, detailed account of a Saru Yume encounter acts as a catalyst for infection.

Recommended Protocol:

  • Containment: Disinformation campaigns across image boards to categorize accounts of Saru Yume as creative writing exercises (Creepypasta).
  • Prevention: Amnestic administration for individuals who report “recursive train dreams” persisting for more than three nights.
  • Observation: Researchers are currently investigating if the entity is an autonomous AI construct left over from early 2000s net-archeology or an invasive psychic parasite tapping into the collective unconscious of forum users.

Archivist Note: If you have experienced the announcement on the train, do not close your eyes. If you see the Monkey, disconnect from all networked devices immediately.