Same here -- I live in the country, and we put our dumpster out Tuesday night for an early Wednesday pickup. Sometimes, it's early, 5:30-ish, but usually around 6:30 to 7:00.
I guess there's a possibility the trash service runs earlier in some areas, especially if they have long routes to complete and need the extra time, but 3 am seems too early for most residents.
CP's and KP's house is rural-residential. Nice homes, paved streets. Not on a sanded road like mine, so I don't know, but trash pickup can be noisy, and usually they don't start in the middle of the night.
But, you're right--I just don't know.