2am dumpster pickups

It's 2am. Any reasons why garbage trucks would decide to unload dumpsters right now??? It's been enough of a pattern to where I'm at my wits end. Unloading a dumpster is so loud and it's right outside of my house across the street. Why would they do this in the middle of the night when people are trying to sleep? Is there an actual reason for this timing? I've lost so much sleep because of this. If anyone knows I'd be really appreciative.