No, they aren't boring at all. I love reading them. And I don't fall asleep reading other things, like news articles or fiction. But my brain's response to seeing Greek symbols is to fall asleep.

Too cozy syndrome? :)

I have it similar - but when listening about math/physics. Usually play it to fall asleep. I think it's due to my adhd (diagnosed) brain getting the right amount of stimulation.

For me it is if in a cosy position and doing something cognitively demanding. Fell asleep very often during my university studies reading literature. It can happen also if trying to learn something new technical at work, but only if I don't sit at a desk.

If normal or not I can't say...