[Hurlburt88]

Scientific American had a great article on "jet lag" about 15 years ago.   As someone who travels almost every week, and internationally 4-6 times per year, I took great interest.  Their conclusions IIRC included that jet lag is quite real, and we adjust about 1 hour each day.  They did say west to east was harder, but it was a secondary effect.   Mitigations include spending time under a blue sky--something specific about that set of light wavelengths.  Also high liquids, avoiding alcohol, and trying to allot enough time for sleep before, during, and after trip;  some studies also concluded that minimizing caffeine and judiciously using sleeping pills helped.

[Hurlburt88]

Scientific American had a great article on "jet lag" about 15 years ago.   As someone who travels almost every week, and internationally 4-6 times per year, I took great interest.  Their conclusions IIRC included that jet lag is quite real, and we adjust about 1 hour each day.  They did say west to east was harder, but it was a secondary effect.   Mitigations include spending time under a blue sky--something specific about that set of light wavelengths.  Also high liquids, avoiding alcohol, and trying to allot enough time for sleep before, during, and after trip;  some studies also concluded that minimizing caffeine and judiciously using sleeping pills helped.