That's the nature of hypnagogic hallucinations. They do seem completely real. The one I described, though I realised straight away what was going on, still troubled me at the time. Essentially it's a waking dream, your mind goes into screensaver mode even though you are fully awake and aware.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'