The actress - who plays journalist Sloan Sabbith - joked to Access Hollywood that she is spending nearly every free minute trying to memorise Newsroom creator Aaron Sorkin's snappy dialogue.
"I've been having a hard time sleeping lately... I think my mind's in overdrive," Munn teased.
She continued: "I'm studying [Aaron] Sorkin lines non-stop, so I just can't shut it off."
Munn went on to quip that Sorkin's dialogue has its own rhythm comparable to a song's melody.
"I can't sing, but reading Sorkin dialogue is like singing. So if you get that melody and you learn it, it's like singing your favourite song over and over," the star declared.
Munn also recently landed a guest role on New Girl as Nick's (Jake Johnson) love interest Angie.