People in Hucknall have spoken out about a "bizarre" humming sound that they can hear at night.
The mysterious noise has been going on for weeks and has been described like a "UFO hanging outside of your house."
It can be heard in different parts of Hucknall.
Builder Daniel Martin, 35, is one of many people who are curious as to what it could be.
"I just want to know what it is," said the builder.
"Some nights, the buzzing sound is just really loud and it's the only thing you can hear.
"I think that it could be a drone but I'm not sure. It's a mystery. When everyone finds out what it is, I bet it's going to be something really silly but if people can hear it from miles away, your guess is as good as mine.
"For those who can't sleep easily, it must be horrible. It's been going on for a while now and I'm baffled, I've ran out of ideas."
People have been chipping in online with suggestions about what it is after Amazon worker Rachael Beckett asked if anyone knew what was causing it.
"I heard it at about four in the morning and the sound was very dominant," said the 33 year-old from Hucknall.
"When I opened the window, the sound got louder. It sounds like a UFO hanging over your house. Me and my partner call it the Hucknall Hum.
"I woke my partner up and she heard it. If you've heard it, you can't explain it. Enough people have agreed with me and heard it too. There isn't a logical thing that I think it could be.
"I can't fathom what it could be. It's not consistent and it doesn't happen every night."
She said she was now using earplugs to block it out.
Alan Oliver, 70, and retired has also heard the sound despite being deaf.
"I'm deaf and I have heard it," he said.
"It's definitely coming from outside but it's not keeping me up at night. I use to work at the colliery."
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