1
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It's 9 am. The moka pot is on the stove, as it is every morning. Coffee is the ritual that opens the day.

2
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The need for sleep has a molecule: adenosine. It builds up with every hour we're awake.

3
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Caffeine has a similar shape and takes its place. The signal is blocked, but adenosine is still there.

4
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On the motorway at night, after a strong coffee, 75 per cent drove as if it were daytime.

5
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After a coffee, you feel awake. But the need for sleep hasn't gone.

6
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Coffee masks sleepiness; it doesn't remove it. Pull over: a coffee, then a ten-minute nap. Drive on only when awake.