Sleep-talking (or somniloquy) refers to talking aloud in one's sleep, a phenomena that can be quite loud, and range from simple sounds to  long speeches.

 

Talking in My Sleep recalls these fleeting, unsettling, random images    that interrupt us during the night. For some of us it is fragments of music   – indistinct, but often intriguing sounds that vaguely disturb our sleep.      An important aspect of this piece is the use of unusual timbres, such as extreme sul ponticello (playing close to the bridge of the violin) to make these haunting sound-images more vivid.