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It's ten o'clock. The sun is high over the lake. After a night's sleep, the body is close to its peak.

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Sleep asks for little, the body clock pushes towards the day. For once, the two forces pull together.

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After waking, the brain takes two to four hours to get going. By ten, we're there.

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Sleepiness-related crashes have three peaks: at two, at six and at four in the afternoon. Ten isn't one of them.

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The peak doesn't come at the same hour for everyone: earlier for early birds, later for night owls.

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Without a night's sleep there is no peak. Not even at ten.

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If you can choose when to leave, leave now. If you can't choose, at least you know.

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At ten, your body is on your side. Leave now, not after lunch.