I think you're right. As a matter of fact, most of the Beatles songs have been influenced by their lives - they all have a story. This is one of the reasons I love the Beatles so much! Lucy in the Sky With Diamonds wasn't just a song that was influenced by the drug-taking of the band. It was based on a drawing on a drawing that John's son did. And Martha My Dear was named after Paul McCartney's dog, Martha, a huge sheepdog.
Rock on for cool songs.