What may have been a factor in Biden's poor debate performance.

 Bob Woodward said this evening on MSNBC that Biden's debate performance was so bad that there must have been some causal factor or factors operating.  As I was listening to him, I suddenly found myself connecting to the fact that my wife and I returned from a trip to Finland last Friday and it featured a 9 1/2 flight through several time zones.  One week after our return we are still having some residual fogginess, sleep and meal dysfunctions,  and occasional overall feeling of things not being quite right.  And we are in our 80's just like Joe Biden and jet lag according to the following article cited next .  Now remember that Biden had two hard working literally back to back trips to Europe in the two weeks before the debate. Jet lag also impacts older people more strongly and can present lack of focus and tiredness.  I know Air Force One is a flying hotel, but is it possible that this was a factor in his performance.  Just thinking. See: https://www.mayoclinic.org/diseases-conditions/jet-lag/symptoms-causes/syc-20374027.