I fell asleep on the sofa the other day, and I can't remember the dream or anything but my mam said I was speaking at full volume, completely in another language - one that she had never heard before but was definitely an actual language (I immediately assumed it was spanish or russian, as I speak them near-fluently). She said it had no accent or anything

Was I just spouting random sounds, because apparently it sounded like a proper language but could have just been random improvistaion or something. Is it normal? If not, what could be the cause of it?
THanks, Blessed Be! )O(