I've always heard this term but have honestly never really experienced it. Granted my flights are usually west coast to Hawaii or back so maybe it's just not long enough? Depending on the time of year there's either a 2 or 3 hour time change which messes with my sleep a small amount but usually not much. Today was an abnormally long flight due to wind and was a bit over 6 hours. I'm coming up on 50 and keep expecting to feel the "lag" at some point but just never seem to. Am I just not lying far/long enough or am I lucky?