Search Result for "somniloquist": 
Wordnet 3.0

NOUN (1)

1. someone who talks while asleep;


The Collaborative International Dictionary of English v.0.48:

Somniloquist \Som*nil"o*quist\, n. One who talks in his sleep. [1913 Webster]
WordNet (r) 3.0 (2006):

somniloquist n 1: someone who talks while asleep