© UnknownThe mysterious sound woke people up across Hull and East Yorkshire
Others posted about the sound from as far away as Cleethorpes and Derby. Many believed a thunderclap was to blame but the Met Office said there was no storm in the area at the time.
Writing on the Mail's Facebook page, Alan Key said the noise "woke us up and scared us to death. People say it was thunder but to me it sounded more like an explosion."
Friends in Beverley and west Hull told Mr Key they also heard the sound. Karen Holdstock, who lives in the Greatfield estate, said it woke her too.
Martin Hardcastle said it sounded like "amazingly loud thunder" at his house in Withernsea and Ruth Clarkson reported it in Patrington.
Michelle Ketley posted saying she was frightened by how sudden it was.
She wrote: "I've been thinking about it all morning. I was shaking when it woke me up and I'm not scared of thunder at all. It was very bizarre."
Twitter users have also been discussing the sound today.
Sharing her experience with a friend, Corrine in Derby wrote: "I think it was just the one time but it was unreal. Never heard anything like it in my life."
Tony Hamilton in Cleethorpes on the south bank of the Humber took to Twitter after the noise shook him awake.
He said: "That's why I'm awake at this silly hour. Heard something that sounded like a bang."
Met Office forecasters reviewed satellite images for the Mail and said although cloud cover at the time suggested there had been rain, there was no evidence of stormy weather or lightning strikes.
A spokeswoman said: "I can't really see anything that would indicate a thunderstorm. The satellite shows banks of cloud going over but I can't see anything that would cause a loud bang."
it was a frost quake? Oh wait, there is no frost.