Quote Originally Posted by TimeDragon97 View Post
It's just hypnogogic hallucination. No need to be worried. However, I recall reading that attaining lucidity so quickly may be a sign of narcolepsy. I don't know anything more, so don't take my word for it.
This is a likely scenario, especially when you have that feeling of knowing you're falling asleep. I get it all the time, try to ignore them but let it pass as an interesting phenomenon IMO. Do you have visual activity as well in this state?