Scientists 'talk' to sleeping people by invading their dream

© K Konkoly
A participant sleeping in the lab as electrical signals from his brain and eyes are displayed on a computer monitor.
Scientists have successfully "talked" to a sleeping person in real-time by invading their dreams, a new study shows. The researchers say it's like trying to communicate with an astronaut on another world.
Dreamers can follow instructions, solve simple math problems and answer yes-no questions without ever waking up, according to the results of four experiments described Thursday (Feb. 18) in the journal
.
The researchers communicated directly with sleeping participants by asking them questions and having them respond with eye or facial movements during lucid dreams — when people are at minimum aware that they are dreaming. (Some lucid dreamers can control what happens in their dreams.)

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