A new one to add to the list of ways I don't like to be woken up at 3:30 a.m. -- Having the police going through our yard with flashlights and dogs. We called the dispatch office, and apparently someone had dropped a stolen car a couple of blocks away and they were looking for the suspect who'd fled on foot. There's been some sort of police activity in every neighborhood I've lived in at one time or another, and in and of itself it's only mildly upsetting. But it kind of gets your adrenaline going and then it's really hard to get back to sleep.
I think the other things on that list would have to be: dog vomiting in the bed; dog peeing in the bed; prank phone call; and smoke alarm going off.
In the grand scheme of things, all small annoyances. But they don't seem small during the wee hours.