system
A chat on 4chan
human
Has anyone else been hearing these? Typically around 3-4 AM

I've seen a lot of discussions about people hearing similar things from the midwest-East coast. Loud explosions, roaring sounds, and just overall low pitched noises that can't be explained.
gpt
possible logical (maybe not probable) explanations:

-fireworks
-earth movement sounds
-atmostphere entry sounds
-plane sounds (do we know about all the birds flying out there?)
-atmospheric events 

I have heard some weird stuff in CA. Have seen glass windows rumbling with no apparent earthquake or discernable sonic booms. Always made me question.