It is now a full week since we arrived in France and we are well over any jet lag. Personally, I have never it difficult adjusting my sleep-wake pattern after a shift in longitude, and I suspect many travelers overestimate jet lag. Singapore Airlines landed us in Europe early in the day, very tired from lack of sleep. By the end of that first day, we were exhausted and had no trouble falling asleep and staying asleep for most of the night. Jet lag over.