Your brain makes stuff up (or remixes stuff from your past memories) all the time, but usually we can easily distinquish between the “inner voice” of our imagination (or mental images) and reality. In some cases, for a number of different reasons, it fails and we experience hallucinations. Also, sometimes our brain thinks that it detected something in the outside noise and makes you think that you actually heard somethink.
Hallucinations are not great but what you are experiencing when you are falling asleep is pretty normal and it’s called hypnagogic hallucinations. They aren’t a sign of any illness, it’s just your brain slowly preparing to fall asleep, shutting down some systems and activating some others, so that’s kinda like fragments of an incoming dream get mixed with reality.
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