Do deaf people do sign language in their sleep? © Getty Images

Do deaf people do sign language in their sleep?

Asked by: Heidi Nelson, London

Anecdotally, some people who’ve learned sign language do occasionally use it in their sleep. There’s not a lot of scientific data, but one 2017 case study describes a 71-year-old man with a severe hearing impairment, who also had ‘rapid eye movement (REM) sleep behaviour disorder’. This involves a loss of paralysis during REM sleep, and the man was observed signing fluently. The researchers could even get an idea of what he was dreaming about by decoding his signs.

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