My partner often asks me if something she experiences daily is normal or if it’s due to her autism.
In this case, she asked me if I can hear my eyelids every time I blink.
Personally, I can only hear them when I’m very sleepy, my surroundings are dead silent, and only when I intensely focus on the sound.
My best guess is that it has something to do with normal people being able to filter out sounds better than people with autism. I’m also guessing that when normal people get tired, this filtering weakens to the point where they hear and feel more than they normally do.