This story originally appeared on People.com.
So it's understandable that the 19-year-old gymnast might be a little exhausted after her run in Rio, and try to catch some zzz's on the long flight home from Rio.
Well, understandable to everyone but teammate Aly Raisman, apparently. The 22-year-old women's gymnastics captain caught Biles snoozing on the plane Monday night, teasing her pal in a sweet Instagram post.
"Miss @Simone_Biles fell asleep before we took off," she wrote. "WHO'S THE GRANDMA NOW GUYS?"
Team U.S.A. has long poked fun at Raisman for her love of sleep. "All the girls call me 'Grandma' or they call me 'Mom' because they all think that I sleep too much," she explained NBC News.
"She's like our sleeping little grandma," Biles confessed to the news network. "She'll text me at 9:30, 'Simone be quiet' because she can hear us through the walls. And she always blames it on me. And I'll be like 'Okay grandma, go to bed.' "
"It's normal to be tired when you work out a lot," Raisman said in her defense. "But [Biles] is just never tired, I don't understand."
"We always joke about it," Biles continued.
While the young athletes may continue to tease one another, they've both got a lot to celebrate right now – including some very handsome admirers.