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by Squithrilve 3085 days ago
There are ways to communicate from the REM state back to the real world used in research on lucid dreams:

> Previously to sleeping, volunteers like Worsley agreed on preset eye movements they would perform once they achieved lucidity in their dreams, which La Berge could record in the lab.

Source: http://dreamherbs.com/eminent-dreamers/stephen-laberge/