No, it is not true that “Teresa Fidalgo will sleep by your side” or harm you if you do not share that message. The whole thing is an internet urban legend and chain-message hoax, not a real ghost story.

What the message actually is

  • The line “Hi my name is Teresa Fidalgo… if you don’t send this to 20 people I will sleep by your side forever” is a copy‑paste chain message that has circulated on WhatsApp, Instagram, Facebook and forums for years.
  • Variants of it threaten that someone’s mother died or something bad happened because they ignored the message, which is a classic scare tactic used in chain letters.

Origin of “Teresa Fidalgo”

  • The name comes from a Portuguese short horror film called “A Curva,” made by director David Rebordão, which uses a Blair‑Witch‑style “found footage” setup with a girl hitchhiker named Teresa Fidalgo.
  • The director has openly confirmed that the story is fictional; there is no verified accident or real person matching the legend that the chain messages describe.

Is there any truth to the threat?

  • There is no evidence of a real ghost named Teresa Fidalgo haunting people or “sleeping by their side” because they did not forward a message; no police reports or credible records match the supposed 1980s accident used in the story.
  • These messages spread because they scare people into forwarding them, not because anything supernatural happens; ignoring them is completely safe.

How to handle these messages

  • Do not forward or repost the message, even “just in case.” Ignoring and deleting it is the best response.
  • If friends are worried, you can calmly explain that it is a scripted horror character and an online hoax, and nothing bad will happen if they stop sharing it.

TL;DR: “Is it true that Teresa Fidalgo sleeps by your side?” – No. It is a fictional ghost from a horror short film whose name is used in viral chain messages; nothing supernatural will happen if you ignore or delete them.

Information gathered from public forums or data available on the internet and portrayed here.