CNN

Sen. Barack Obama listens to British Tory Leader David Cameron Saturday in London.

LONDON (CNN) – It is no secret that Sen. Barack Obama’s whirlwind tour of the Middle East and Europe has left him, and everyone staffing and covering him, absolutely exhausted.

When asked how he was feeling the other day, he told reporters aboard his campaign plane that he was feeling a bit “sleepy.”

Earlier today, while meeting with Conservative Party Leader David Cameron, the pool camera microphone picked up some light banter between the two men about Obama’s current state of fatigue.

Cameron told the candidate, "You should be on the beach...you need a break. Well you need to be able to keep your head together."

Obama told Cameron he would try to take a week of in August. And he said he got advice from a Clinton White House veteran on how to handle the demands on his time.

Obama said, "Somebody who had worked in the White House who-not Clinton himself- but somebody who had been close to the process, said that should we be successful that actually the most important thing you need to do is to have big chunks of time during the day when all you're doing is thinking and the biggest mistake that a lot of these folks make is just feeling as if you have to be..."

Cameron interjected, "these guys just chalk your diary up."

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