For all their exertion, the team must try to keep their body temperatures cool while they are moving.

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"If you're exposed to the outside elements, your body can't cool down at night, " he said.

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Experiments by Andrew Gallup at Princeton University, his father Gordon Gallup and a colleague found that yawning is suppressed by a cool pack strapped to the forehead or by summer temperatures that are higher then body temperature, and that therefore the purpose of yawning may be to cool the brain by inhaling air.

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The body is eager, but the atoms are cool.

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"Luckily, we had decided that we were going to wear body armour and helmets because we were going in at first light and it was still quite cool, " he said.

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"Referees, should they so wish, have the opportunity to conduct post-match media interviews, after 30 minutes' 'cool-down' time, to clarify any point of law, " said a spokesman for PGMO, the body responsible for top referees.

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