I believe Vader did it in his comic run.

@Aguy.png Wasn't that when he opened that portal into the Force to try to save Padmé? I'm not sure alternate dimensions in spacetime should count. Hmmm...

@Aguy.png, he did do it once in one of his comics.

@SpicetimeContinuum, he still started floating, so it should count.

There's no logical reason why it can't happen, but narratively I do think it makes sense for dark-siders not to levitate during meditation. They're too attached to the physical world to achieve the sort of free-floating peace we see when light-siders meditate and really clear their minds. The Sith meditate to ground themselves to their passions, while the Jedi meditate to release themselves from them and attain serenity.