Shizume of the sleeping Tsukumo

1883, sixteenth year of the Meiji age, Tokei (Tokyo). Shizume Kurahashi, a "worshipper" of the scientific method, suffers of a particular disturb: when her heartbeats become irregular she falls in a sleep full of nightmares, while an arachnid-like creature appears from her chest. Can this be explained with scientific reasons? Shizume believes that...