What did researcher Stephen LaBerge and his colleagues ask experienced lucid dreamers to do to signal their awareness of dreaming?

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Stephen LaBerge and his colleagues asked experienced lucid dreamers to move their eyes in a distinctive pattern as a signal of their awareness of dreaming. This is because eye movement can be detected even during sleep, allowing for a reliable method of communication between the dreamer and the researchers.

What Did Researcher Stephen LaBerge and His Colleagues Ask Experienced