sentences:  Oneiroid syndrome
  
  Oneiroid syndrome (OS) is a condition involving dream-like disturbances of one's consciousness by vivid scenic hallucinations, accompanied by catatonic symptoms (either catatonic stupor or excitement), delusions, or psychopathological experiences of a kaleidoscopic nature.The term is from Ancient Greek "ὄνειρος" ("óneiros", meaning "dream") and "εἶδος" ("eîdos", meaning "form, likeness"; literally "dream-like" / "oneiric or oniric", sometimes called "nightmare-like").