Breaking Down the Differences Between "Priscilla" and the Presleys' Real Life

In the movie, when Priscilla comes to visit (and then live with) Elvis, he is using drugs, and he gives some of them to her. After she takes a sleeping pill, she sleeps for multiple days.

The sleeping pill incident is described the same way in the book (though it happens a little later in her and Elvis's relationship). And in both the book and movie, Elvis gives Priscilla pills to help her stay awake when she's attending high school (but staying up every night with him). Priscilla writes in her book that Elvis would only wake up in the late afternoon, so she would often get back in bed with him after a day at school.