Definitions of Sleep-Utterance
Sleep-utterance is a general term denoting vocalization in association with sleep, including somniloquy.
Somniloquy (sleep-talking, sleep-speech) is the utterance of speech or other psychologically meaningful sound in association with sleep without subjective simultaneous, critical awareness of the event in its real environmental context, or how it might appear to a wakeful observer. Thus, somniloquy includes: (1) utterances consisting of one or more clearly enunciated words and/or mumbled words that although unintelligible, clearly convey the impression of attempts at speech; and/or (2) affectively tinged sounds other than speech that appear to possess some psychologically meaningful quality, such as laughter, weeping, humming, or whimpering.
Sleep-utterances also include nonlinguistic vocalizations that often seem devoid of psychological significance, such as isolated monosyllabic grunts, brief moans, groans, and sighs frequently occasioned by or associated with a change in body position.
First, in association with sleep is more appropriate than during sleep. Although some electrographic records obtained precisely coincident with sleep-utterance episodes have been those of unambiguous, typical sleep, the majority of them possess varying degrees of muscle tension and/or movement artifact that do not permit definite classification under standard terminology