There's no rest for the wicked.
And the same mantra applies to Floyd Mayweather.
The boxing legend continues to tease fight fans from around the globe about a potential return to the ring.
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And this time, boxing die-hards have good reason to be hopeful after 43-year-old Mayweather was reportedly partaking in 2am sparring sessions.
It's understood super middleweight Denis Douglin was woken up one night when he received an unexpected call at 1am from none other than 'Money Mayweather' asking him to spar in Las Vegas.
Mayweather hasn't fought since August of 2017 but has always flirted with the idea of a mega-money comeback.
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Now, though, his latest rigorous training regime suggests he's in the process of plotting a massive return.
"He called me up around 1am. I know he likes to train at night. So I got up and told my mother that Mayweather wanted to spar," Douglin told Vegas Insider.
"We got to the gym before him, I was walking around taking pictures and stuff. He walked in at 2am with so much energy and so excited, and he let me know that he was going to beat me up.
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"He was making fun of me saying harmless stuff like: 'Oh, you think you're so bad, you got all of those muscles, but I'm still going to beat you up'.
"I love the fact that he was excited to beat me up, it was like an honour to have Mayweather talking bad about me.
"The first three rounds were great work, still talking trash back and forth to each other, and then in the fourth round he said: 'let's turn the bell off, we're going to spar until you quit'."
Love him or hate him, no one can deny Mayweather is one of the most prolific boxers in history - and appears he's still got the same burning desire to compete today.
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The controversial megastar won fifteen major world titles over the course of his decorated 21-year boxing career.
But the question still remains as to whether money-loving Mayweather wants to put his perfect 50-0 record on the line once more.
He did it back in 2017 when he took on UFC fan favourite Conor McGregor in a bout that recorded the second highest pay-per-view buys in history.
And his newest training partner believes he could be tempted to do it again.
"I do think this could happen (a fight against McGregor or Khabib)," Douglin said.
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"I think he's going to fight UFC guys.
"It's actually quite interesting because I'm left-handed and McGregor and Khabib are both left-handed. So him choosing to spar me, that might be the reason why.
"That's something someone said to me the other day and I was like, 'you know what, that makes sense', so it's very possible.
"The McGregor fight generated so much money, why not do something like that again or fight another UFC fighter if he's making millions of dollars?"
Featured Image Credit: PATopics: Conor Mcgregor, Boxing, UFC, Australia, MMA, Floyd Mayweather