Sleeptalk

Mummy told me this morning that I sleeptalk last night. I talked about "bubble bubble" and she thought she heard me saying "dua gu". The talk was quite long but she couldn't record it in time coz' she had to put her handphone battery back etc.... by the time she pressed RECORD, I stopped.
Mummy also said sometimes I do talk in my sleep. Is it? I think I must be dreaming that's why.