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Someone who walks in sleep is called sleep walker or somnambulist. Is there a word in English meaning somebody who talks in sleep?

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There is somniloquent:

Somniloquent

We are [referring to] sleep-talkers, a less-often encountered term than sleep-walkers, even though the former are more common.

Medical terminology has dignified words for them both: somnambulants and somniloquents.

Some sufferers have been known to do both at once: you might call this the Lady Macbeth syndrome.

[Michael Quinion; World Wide Words]

As ambulant is primarily an adjective, and eloquent obviously is, doubtless the adjectival sense of somniloquent is in use. Indeed, English Word Information (of whom I've never heard till now) give only the adjective.

  • So, sleep-talker is a word too?! – Englishfreak Jun 13 '15 at 9:40
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    I'm against omniproductivity, except tongue-in-cheek, but wouldn't argue with Quinion too often. – Edwin Ashworth Jun 13 '15 at 9:44
  • Seeing as we have words like "ventriloquist," it seems the related noun would be "somniloquist"? – herisson Nov 11 '16 at 19:53
  • Quinion lists 'somniloquent' as a noun here (thus the plural form), but 'somniloquist' is also obviously around. But since they're both likely to be largely confined to the medical domain, the former might be the less uncommon. – Edwin Ashworth Nov 11 '16 at 22:28
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"Sleep talking, or somniloquy, is the act of speaking during sleep. It's a type of parasomnia -- an abnormal behavior that takes place during sleep. It's a very common occurrence and is not usually considered a medical problem.

The nighttime chatter may be harmless, or it could be graphic, even R rated. Sometimes, listeners find the content offensive or vulgar. Sleep talkers normally speak for no more than 30 seconds per episode, but some people sleep talk many times during a night.

The late-night diatribes may be exceptionally eloquent, or the words may be mumbled and hard to decipher. Sleep talking may involve simple sounds or long, involved speeches. " (Source)

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