Astral Noises

When ever i try to project i start to hear noises... i know that normal with projection, but has any one had a fan running near them and constantly hear it get REALLY loud then back to normal and constantly repete itself, would you all consider that astral noises or is that jus hallucination from being in a trance?...??.. b/c it has happened that last week or so i tried to project ;D