I went to investigate the alarm. Took me a while to find the source but it was in the basement (I’m in the attic) and it turns out the water system detected a leak and that’s what it was beeping about. Got my dad to come with me to the utilities room (I wasn’t about to go into a dark random room alone to investigate a weird sound) and he found a way to fix it for the night. I feel much less crazy now lol