Hugh Jackman jumps around in his sleep like a "fish out of water".
The 46-year-old actor is known as "Guppy" - a tropical fish, also known as a rainbow fish - to his friends because of the active way he is when he settles down for a doze, and joked his wife Deborra-Lee Furness has had to dodge out of the way on occasions to avoid his flailing around.
He said: "I am nicknamed Guppy because of the way I sleep, like a guppy out of water, if you've ever seen a fish out of water they flop around.
"If you ever see me on a plane or sleeping in a hallway or wherever then I'm literally jumping around like a guppy out of water.
"It's sort of embarrassing and it's been slightly dangerous for my wife at times, she's had to duck if I'm dreaming.
"The way I sleep is not normal."
The star sports a fetching mullet hairstyle for his latest movie 'Chappie' and joked his latest look sparked some "good memories" for his wife because he also had a similar hairdo when he met her on the set of 1995 Australian TV series 'Correlli'.
Speaking to ITV's 'Good Morning Britain', he added: "When I met my wife, it was my first job ever, I had a mullet. It was 'Correlli'.
"It was not a good look, still isn't a good look, but she did fall in love with a man with a mullet so it was just a nice flashback 19 years later.
"On the record, she does not think it's a good look.
"Somewhere deep down in the DNA it was bringing back some good memories. We've been together a while."