Songfacts®:

• This song is about a love that's so physically intense and overwhelming, it leaves you feeling like you're jet-lagged or experiencing the effects of a hangover. In an interview with YM in 2004, British soul singer Joss Stone commented: "It's how you feel when you're in love. Sick, but in a good way."
• "Jet Lag" was one of the first songs Stone wrote. Having won the British television talent show Junior Star for a Night, the teenager was invited to a songwriting session with Conner Reeves and Jonathan Shorten. She explained to Songwriting Magazine in 2020: "I was about 14 when I wrote that and really I was still in the learning process of writing, so the leaders in those writing sessions were Conner Reeves and Jon Shorten, and I still write with them today."
  
  Stone was subsequently signed to S-Curve Records and released the covers album The Soul Sessions in 2003. As a result, "Jet Lag" wasn't heard in public until 2004, when Stone released her first collection of originals, Mind Body & Soul.
• According to Stone, "Jet Lag" is one of the songs she's most proud of from Mind Body & Soul. She noted to Official Charts in 2015: "I like some of the songs on that album. Songs like 'Jet Lag' I still love today, but some of the songs I really don't like. It was more of me than The Soul Sessions was so I was pleased that they were putting something out that I had a hand in. That was a real confidence boost for me. I felt like I was an artist rather than just a singer."
• Mind Body & Soul soared to the top spot in the UK, making Stone, at 17 years and five months old, the youngest woman to achieve such a feat. This record remained unbroken until 2019, when Billie Eilish, at 17 years and three months old, went to #1 with her debut album, When We All Fall Asleep, Where Do We Go?. In the US, meanwhile, Mind Body & Soul reached #11. The album also earned Stone three Grammy nominations: Best New Artist, Best Pop Vocal Album, and Best Female Pop Vocal Performance for "You Had Me."