Final answer:
Light therapy is the most promising new treatment for jet lag, helping to align our biological clocks with the external environment.
Step-by-step explanation:
The most promising new treatment for jet lag appears to be light therapy. Light exposure during working shifts and darkness when not working can help align our biological clocks with the external environment. This can combat symptoms of insomnia, anxiety, and depression that are associated with jet lag (Huang et al., 2013).