Our bodies are used to specific rhythms of light and darkness, which dictate the times we eat, sleep and do all sorts of fun things. These rhythms are sacred and not to be messed with unless we willingly board a high-speed aircraft for long-distance transmeridian travel from east to west.
Jet lag is a chronobiological problem, much like a mismatched dance partner. Being wide awake at 3am, when everybody else is snoring and enjoying fresh ice dreams, is a clear symptom of a self-afflicting disease. Nothing heals travel like staying at home.
Birds hate jet lag so much that, if they feel like travelling, they mostly fly from north to south and back. This is not a bad idea because if you keep flying up and down, the Earth will rotate to your destination, which your body will reach in complete sync with its time partner.
Why else would the Earth rotate for?