Songfacts®:

• By their fourth album, Simple Plan had grown families, which had become their focus. This song is about being away from their loved ones, with frontman Pierre Bouvier singing about his jet lagged heart.
• Pierre Bouvier and drummer Chuck Comeau did most of the songwriting for the band's first three albums, but they got a lot of help on their fourth. The wrote "Jet Lag" with three other songwriters: Nolan Sipe, Ryan Petersen, and Béatrice Martin (known as Coeur De Pirate).
• Bilingual Canadian rockers Simple Plan released this song in two languages, with English singer-songwriter Natasha Bedingfield singing on the English version and a French-Canadian vocalist Marie-Mai, who was one of the top finalists of the singing competition Star Académie on the French rendering.
• You may recognize Bedingfield from such hits as "Unwritten," "These Words," and "Pocketful of Sunshine." Singer Pierre Bouvier said of Bedingfield's contribution: "For the first time we are doing a duet with a female vocalist. Natasha Beddingfield rocked it and it sounds amazing. She has an amazing voice and she totally blew us away with her vocal talent."