recommended arriving a few days early for anything important you have scheduled. One of those was the Mayo Clinic:
https://www.mayoclinic.org/diseases-conditions/jet-lag/symptoms-causes/syc-20374027#:~:text=A%20few%20basic%20steps%20may
Arrive early. If you have an important meeting or other event that requires you to be in top form, try to arrive a few days early to give your body a chance to adjust.
And being a frequent flyer makes it worse.
Biden really had no time to recover from jet lag early last month...and that was also when he heard the verdict in his son's trial. From the NYT June 12:
https://www.nytimes.com/2024/06/12/us/politics/biden-europe-travel.html
Still, most American presidents will try to avoid making two back-to-back round trips to Europe, separated by about 60 hours on the ground at home. Yet that is what President Biden is pulling off this week.
-snip-
Mr. Biden left the United States for D-Day celebrations in France last Wednesday, June 5; stayed the weekend for a state dinner in Paris; and returned to his home in Delaware late Sunday. He left Washington again early Wednesday, June 12, to fly to the southeast coast of Italy for the annual gathering the Group of 7, the traditional summit of leaders of Britain, Canada, France, Germany, Italy and Japan.
When Mr. Biden looks back at those two round trips — roughly a day and a half of flying, all told — he may remember only what happened in between: the conviction of his only living son, Hunter Biden, on charges of lying to obtain a gun permit.
But the two round trips raise the question: Why didn’t he just stay in Europe for a couple days, play a round of golf, visit some American troops, maybe huddle with a foreign leader or two? He is, after all, 81, and some of his aides who are half his age were complaining about lost sleep cycles.
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