Researchers have communicated with people while they were dreaming—but not by connecting two sleepers inside a shared dream. In a 2021 experiment, teams asked questions or gave sensory prompts to lucid dreamers during verified REM sleep. Some dreamers answered with prearranged eye movements or facial-muscle signals. Most attempts, however, produced no response.
What “communicating with a dreamer” means
The phrase can sound like something from Inception, but the experiment was not dream sharing. A researcher sent a prompt to one sleeping participant, and the participant sometimes returned a coded answer while still asleep. It did not show that two people can meet or talk in each other’s dreams.
The peer-reviewed study, “Real-time dialogue between experimenters and dreamers during REM sleep,” was published in Current Biology on February 18, 2021. Four independent teams in France, Germany, the Netherlands and the United States tested whether lucid dreamers could respond to questions during rapid-eye-movement (REM) sleep. Read the paper.
How the experiment worked
Researchers checked sleep and lucidity
Thirty-six people took part across the four teams, including participants with different levels of lucid-dream experience and one participant with narcolepsy. Researchers used polysomnography—physiological recording used to assess sleep stages—to verify REM sleep and track when prompts and responses occurred. Participants were trained before sleep on sensory prompts and ways to answer. Many used a prearranged sequence of large left-right eye movements to signal that they knew they were dreaming.
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Prompts had answers researchers could score
During sleep, experimenters gave novel tasks such as simple arithmetic, yes-or-no questions, and requests to distinguish sensory information delivered as light, sound or touch. The researchers knew the correct answer, allowing them to score a response rather than interpret an open-ended dream report.
Replies were coded bodily signals
Dreamers answered with volitional eye movements or selective contractions of facial muscles. They did not speak a free-form conversation aloud, and the researchers did not decode thoughts. The method was a narrow, trained signal system that let a sleeping participant indicate an answer.
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What the results showed
Across 158 attempts made during signal-verified lucid dreams, researchers recorded 29 correct responses (18.4%), five incorrect responses (3.2%), 28 ambiguous responses (17.7%), and no response in 96 attempts (60.8%). These are trial outcomes, not the percentage of participants who could communicate.
The paper also reports that 15 of 57 REM sessions included signal-verified lucid dreaming. In 47% of those lucid-dream episodes, at least one query received a correct response. That episode-level measure is different from the 18.4% correct-trial rate: it counts whether an episode contained at least one correct answer, not how many individual attempts were correct.
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Sleep-stage checks matter because a response is only evidence of communication during a dream if the participant was asleep at the time. Independent sleep experts unanimously scored the physiological evidence as REM in 26 of the 29 correctly answered trials; all analyzed trials were scored as REM by at least two of three expert scorers.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this does—and does not—establish
A real-time method for studying dreams
Ordinary dream research often relies on a person describing a dream after waking. This study instead tested a prompt-and-response exchange during sleep: the timing was tracked, sleep was assessed physiologically, and replies used agreed signals. Northwestern’s announcement described the result as showing that people in REM sleep can interact with an experimenter and engage in real-time communication. Northwestern’s account of the study.
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Not reliable conversation or dream sharing
The finding is a proof of concept, not evidence that an outside listener can freely converse with any sleeping person. Most attempts got no response, and some responses could not be interpreted confidently. Replies were limited to trained physiological signals, not ordinary conversation. The authors also note that their studies were not designed to formally compare communication during lucid dreams with communication during non-lucid dreams.
The study therefore supports a specific conclusion: under laboratory conditions, some lucid dreamers can receive a prompt and return a simple coded answer during REM sleep. It does not establish mind reading, dependable communication on demand, or a consumer technology for exchanging messages through dreams. The paper’s bibliographic record is available from PubMed.
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