I am normally very unsympathetic towards people who moan about jet lag. I think this is because I have spent a lot of time with particle physicists who are always on planes. I remember Carlo Rubbia calculating that he had a mean average velocity of 80kph.
However on return from San Francisco this time, I have suffered badly. It has taken a long time to readjust. Basically I fall fast asleep at 6pm, usually when someone is speaking to me, and then wake up at 2 am.
The advantage is that I have witnessed a lot of dawns.

One morning early I walked forth
By the margin of Lough Leane
The sunshine dressed the trees in green
And summer bloomed again
I left the town and wandered on
Through fields all green and gay
And whom should I meet but a colleen sweet
At the dawning of the day.
No cap or cloak this maiden wore
Her neck and feet were bare
Down to the grass in ringlets fell
Her glossy golden hair
A milking pail was in her hand
She was lovely, young and gay
She wore the palm from Venus bright
By the dawning of the day.

