Fun fact: if you take two phones, and call one of them with the other, and talk into one of them, they get into a weird feedback loop where they make the most horrific screechy noises; think nails on a chalkboard turned up to 11. This is what I thought Millie was going for lol, although what she actually ended up doing is also great (and probably more creative).
I sleep all night without waking up (unless I have a nightmare), for me the issue is falling asleep. Takes me way too long.