Crib speech is self-talk that occurs among children between ages of 1.5–3. It happens at the child’s bed-time, distinctly when feeling that she/he is alone, just about before falling asleep. Somewhat similar to “private speech”, as a speech genre, it has a characteristic appearance in both form and content, which has been difficult to explain up to date.The “dialogical self” is a concept that describes the mind’s disposition to imagine internal dialogues involving participants in different positions. Hubert Hermans’ dialogical self theory (DST) proposes that the self, as a society of mind, includes a multiplicity of interacting self-positions. “Autocommunication” describes communication with oneself. The concept is best known after Juri Lotman’s work in cultural semiotics, who distinguishes two types of autocommunication: the mnemonic type of reminding oneself of something; and the type in which a communicating subject actively interacts with, and interprets oneself – the “I-I” type. Specifically, the “I-I” type is recognizable in personal diaries, internal monologues and other forms of self-talk.Both semiotics and DST have sought to surpass the internal-external divide and hold that phenomena of mind, external or internal, are communicative in nature. This paper argues that “I-I” type autocommunication as a secondary modelling system explains dialogical processes within an individual person’s mind. The study of dialogical self as a textual phenomenon within which the discourse guides communicative interaction and the subjective positioning in relation to the discourse, proves beneficial to understanding the psychological self. This is demonstrated in the analyses of crib speech.