I have no idea what it is but I can hear a constant low rumbling coming from somewhere. It's weirdly comforting because I used to live somewhere that had a similar sound and it reminds me of that.
Also I'm not looking forward to the internet being very annoying for a day. Grumble grumble
Yet another cleaning update: I cleaned. tomorrow I shall clean more. My room is tiny so I'm playing vacuum Tetris. Moving stuff around, vacuuming under, moving more stuff, etc. Tomorrow I have to pull the entertainment unit out and get behind it
Second night of constant droning noise. No idea what it could be, but it's loud enough to be heard over the rain.