Dream netlore
Japanese web · 2000
- Status
- Internet-born legend
- Reading time
- 7 minutes
- Origin
- 2channel occult board
- Confidence
- Early post traced
The train returns when sleep does
Saru Yume
A lucid dreamer boards a miniature monkey train and hears each passenger’s fate announced. Waking up only postpones the next stop.
By the Yokai Signal editors · Published · Updated
Every legend leaves two records: the story people repeat, and the path it took to reach them.
01 / THE STORY
A ride whose announcements come true
The narrator says they sometimes realise mid-dream that they are dreaming and can wake themselves at will. One night they find themselves alone on the platform of a dark, unstaffed station. An unnatural announcement says a train is coming and that boarding it will lead to something terrible. Reasoning that they can always wake up if it gets frightening, the narrator gets on anyway.
The train is not an ordinary railcar but a small amusement-park-style monkey train, the kind that children ride. A few pale passengers sit in a row. When the train enters a tunnel, the onboard announcements stop naming stations and begin describing fates that are about to befall the passengers, one by one, starting at the back and moving steadily toward the narrator. The details are gruesome, so this page does not repeat them.
The narrator wakes just before their own turn. They tell friends about it the next day, and nothing happens for four years. Then, as a university student, they dream it again, resuming almost exactly where it ended. The escape is harder this time, and the narrator reports a voice warning that the next encounter would be the last. The post ends with the fear that the next dream could be fatal in real life.
The nightmare remembers its place even when the dreamer tries to forget the route.
02 / THE TRACE
The earliest surviving version is smaller than the legend
Saru Yume is among the oldest well-known stories of the Sharekowa thread series on 2channel’s occult board, whose first thread was opened on August 2, 2000. A detailed reconstruction of the early post dates the surviving version to that same day. It lists the text as post 9 at 07:03, with continuations at posts 12 and 13 a few minutes later, in a thread archived as starting at 02:57. Independently, Kosuke Oshimi’s folklore paper fixes the opening of the series itself on August 2, 2000, so the starting date of the thread does not rest on a single web page.
There is an important caveat from the reconstruction itself: the dates come from a later archived copy, not from the original page, and the account cannot be verified as a real experience. The thread’s founding post invited frightening stories without requiring them to be true. One popular secondary page gives December 2000 instead, and other pages differ again, which is why this dossier follows the timestamped archive.
The wording of the story and the date of the earliest copy are documented. Whether the dreamer existed is not.
03 / VARIATIONS
What was added after 2000
The original does not say that reading the story causes the dream. It also does not state a rule that three viewings are fatal; that is a later summary of the narrator’s personal fear. Another popular addition, that several people can end up in the same dream, is, in the reconstruction’s words, unconfirmed.
The first documented sequel-like text appeared in 2003. A post called Saru Yume Plus, dated May 2, 2003 in thread 36 of the series, says the writer read the original and dreamed a related but different dream four days later. It began with a childhood amusement park memory and changed to a bullet train with unusual station names. The poster offered a rational explanation, that the original left a strong impression, but admitted the story itself might have triggered the dream.
According to the reconstruction, later retellings also simplified the story into fixed, rule-like summaries, which is the form many overseas readers now meet.
04 / THE WORDS
Reading the title and the setting
猿夢 (saru yume) is simply monkey dream: 猿 (saru) is monkey and 夢 (yume) is dream. The name comes from the monkey-themed train, お猿さん電車 (o-saru-san densha), a small amusement-park train of the kind that gives the story its childlike edge. The word 電車 (densha) means electric train.
明晰夢 (meisekimu) is the term for a lucid dream, one in which the sleeper knows they are dreaming. The narrator’s ability to wake at will is what makes the first escape plausible. The title of the sequel, 猿夢＋ (saru yume purasu), simply adds a plus sign to the original.
05 / CONTEXT
Sharekowa and the dream tradition
The thread that hosted the story was created, in the words of its first post, to gather frightening stories from books, friends or the net, and not only true ones. Folklorist Kosuke Oshimi’s 2022 paper explains that this was the first of a series which by September 2021 had reached its 364th thread. Saru Yume therefore sits at the very start of internet ghost-story culture, in the year the series began.
Stories about vivid dreams are an old category of folklore, and the reconstruction cites dream research on lucid dreaming and on the way waking memories are woven into dreams as context, not as proof. That kind of explanation is available for the sequel as well. The Plus poster offers exactly that kind of explanation, that a memorable story can seed a dream.
06 / ON SCREEN
A dramatised version in 2021
In 2021 TV Tokyo’s programme Uso ka Honto ka Wakaranai Yarisugi Toshi Densetsu produced a ten-part short-drama series for streaming. All episodes were released on the Paravi service from midnight on March 25, 2021. The first, titled 見てはいけない夢 (Mite wa Ikenai Yume, roughly “The Dream You Must Not See”), is based on Saru Yume and stars Ayaka Imoto. The programme is hosted by the storyteller Junior Chihara.
I have not been able to verify any feature film or major game adaptation of Saru Yume. Fan works, music videos and videos on streaming platforms exist but are outside the sources checked here.
07 / HOW TO READ IT
Three layers, kept apart
The first layer is the documented text: a single account, dated August 2, 2000, in which a dreamer boards a monkey train, wakes before their turn, and dreams it again four years later with a warning that the next time would be the last. The second layer is what retellings added over the years: the contagious dream, the rule of three, and shared dream worlds. The third layer is interpretation, including the readings offered below.
A useful test for any Saru Yume summary is to ask which layer each sentence belongs to. Most of the frightening claims circulating today sit in the second layer, and the documented layer is smaller, quieter and more ambiguous than the legend that grew from it.
08 / WHY IT WORKS
Dream logic closes every exit
A dream requires no haunted location and leaves no physical evidence to test. Familiar objects can change scale or purpose without explanation, and waking is the only apparent escape. This is interpretation, but the story gives the reader exactly one escape and then takes it away.
The serial structure makes the escape temporary. Because the second dream resumes instead of restarting, the story imagines memory stored somewhere outside the dreamer’s control. Later retellings strengthened that idea by turning the reader into a possible next passenger, which is a common move in chain letters and cursed-media stories.
09 / TIMELINE
The record, in order
- 2000-08-02
The Sharekowa series opens, and the earliest surviving Saru Yume text is archived as posted that morning.
- 2003-05-02
Saru Yume Plus is posted in thread 36, describing a related dream four days after reading the original.
- 2021-03-25
Paravi releases the Yarisugi Toshi Densetsu short-drama series, including an episode based on Saru Yume.
- 2021-09
The Sharekowa series reaches its 364th thread, according to Kosuke Oshimi’s paper.
10 / QUESTIONS
Common questions
What does Saru Yume mean?
It means monkey dream in Japanese. Saru is monkey and yume is dream. The name refers to the small monkey-themed amusement-park train that appears in the dream, called an o-saru-san densha. In English the story is often retitled Monkey Dream or Monkey Train, but Saru Yume is the original name.
Will I dream Saru Yume if I read it?
There is no evidence of that. The idea that reading the story passes the dream to you does not appear in the 2000 post; it is a later addition to retellings. A 2003 follow-up post suggests, at most, that a vivid story can influence what a reader dreams about.
When and where did Saru Yume first appear?
On August 2, 2000, in the occult board of the Japanese forum 2channel, in the first thread of a series that collected frightening stories. The early text survives through later archived copies, so the date is well supported but the original page is not available. Whether the dream was a real experience cannot be verified.
Does Saru Yume really cause death in real life?
No documented case supports this. In the original post the narrator is only afraid that the next dream might be fatal, for example through a heart attack. The common rule that three viewings kill is a later summary, not something the poster claimed as fact.
11 / SOURCES
Follow the signal
Sources are listed by what they help establish. A source documenting a legend’s circulation is not proof that the supernatural event occurred.
12 / RELATED
Continue the trail
Browse the full archive or see every legend on the timeline.