BF is a drummer, so he's non-stop tapping. Everything is a drum pad. We both talk in our sleep. I have to do things on 5 or 0 (go to bed at 10:15 as opposed to like...10:13). I crack one of my ankles all day almost and crack my knuckles a few times a day. He cracks his neck. I can't stand cabinet doors or drawers being open. All of his stuff faces the same way in the closet. I can't sleep without a blanket. BF is also always on the left side, bed and couch.
There's probably a bunch more. I may be weirder than him, it's easier for me to think of my quirks than his, but he's pretty sane.
I have to sleep with my top knee up and the other leg stretched out. I also sleep better with a tv on, but SO can't, so I have to make sure to be realllllllly tired by the time I get into bed when he is here.
SO has a habit of closing all the doors I don't want closed (like the bathroom - so it looks like someone is in there, especially since he forgets to turn off lights!!), and leaving cabinet doors open.