reffu

Just chiming in to say that as an American, TimR's answer is accurate to my experiences. If someone said "I slept in" with no qualifiers, I would assume it was intentional. If they said "I overslept" with no qualifiers, I would assume it was unintentional.

It might look silly, but have you tried hearing protection Ear Muff/Headphone (the kind you would use when working with loud power tools or a lawn mower)? It's not the best solution, but in my experience they're better at blocking out sound than most normal headphone, with the trade-off being that they're bulkier and the ones with speakers generally don't have the greatest sound quality

@user5768790 right, and the issue (at least I have) is not with you, but the asker, who did not wait to see what other answers there would be to their question. Your answer is fine and I have no issues with it

@user5768790 The issue people have with this answer is that the american-english tag indicates that the question is specifically asking about American English, even if the asker doesn't mention it directly. The accepted answer should at least answer the question of "what are these clips called in American English?" This answer itself is useful, but the asker should have waited to see what other answers there were so he could accept the most correct one for the question and its tags.