Select the most appropriate word for the given group of words.

One who talks in sleep

somniloquist

The most appropriate word for one who talks in sleep is somniloquist.

• Interlocutor refers to a person who takes part in a dialogue or conversation.
• Soliloquist refers to a person who speaks to themselves, especially as part of a play or other performance.
• Somniloquist refers to a person who talks in their sleep.
• Ventriloquist refers to a person who can make it appear that their voice is coming from another source, such as a dummy.

Somniloquist is the most appropriate word for this group of words because it specifically refers to a person who talks in their sleep. The other words do not have the same connotation of unconscious speech.