Is there a gene for jet lag?

Scientist at the Salk Institute for Biological Scences have identified a master gene that controls sleep and wake cycles and that could explain why most people have a hard time adjusting their sleep cycles when traveling between time zones.

The gene, called Lhx1, could be the key to easing the experience of travelers and shift workers whose sleep interruption has been known to cause health problems in addition to discomfort.