The 24 Hours
The sleep you lost is what makes you drift. Sleep before the next drive.
It is five in the afternoon and on the Simplon road the drive home begins. The drive is short, known by heart, and it looks like the easiest part of the day. A study run on an open motorway says otherwise: twenty-two drivers covered a thousand kilometres in five sessions of a hundred and five minutes, once after a normal night and once after a restricted one. After sleep restriction there were 535 line crossings, against 66. What predicted the crossings was the sleepiness reported before each session, not the feeling of being worn out: two measures that do not coincide. They had been awake eight hours and the stints were short. One short night had been enough.
0:00The drive home
0:08The familiar road
0:15A thousand kilometres
0:26Two different things
0:34It took little
0:41The messageDetails 55 s · 9:16 · four languages · generated images, voice and music, declared as such · 2026-10-03 · Drive Awake
A short drive is no protection: in the study, a hundred and five minutes after a restricted night were enough. If the night was short, the drive home is the moment to get a lift, or to wait twenty minutes before setting off. And what warns you is not tiredness, it is sleepiness: two different things that feel different.
Five in the afternoon. On the Simplon road the drive home begins. Everyone is coming off a full day.
Five in the afternoon on the Simplon road: the drive home begins, and everyone carries the day they have just spent.
Watch this passage (0:00) →
The drive is short and you know it by heart. It looks like the easiest part of the day.
The drive is short and known by heart: that is exactly why it looks like the easiest part of the day.
Watch this passage (0:08) →A thousand kilometres of real motorway: on little sleep, 535 lane departures. After a normal night, 66.
Twenty-two drivers, a thousand kilometres on an open motorway: after sleep restriction, 535 line crossings against 66 after a normal night.
Philip et al. 2005 · Accid Anal Prev · DOI 10.1016/j.aap.2004.07.007
Watch this passage (0:15) →
Sleepiness predicted the mistakes. Feeling worn out didn't. They are two different things.
In the study, the sleepiness reported before each session predicted the crossings; the feeling of being worn out did not. They are two different things.
Watch this passage (0:26) →
They had been awake for eight hours and the drives were brief. One short night's sleep had been enough.
It took neither a sleepless night nor a long journey: eight hours awake and stints of a hundred and five minutes, and the drop was already there.
Watch this passage (0:34) →The same lines you see in the video, side by side. This is where the gaps between languages show: a turn of phrase that does not hold, a word out of place, a figure that changes weight. If you find one, the button next to the line opens the report with hour, language and minute already filled in. All episodes on one page →
line 1 0:01
IT
Le cinque del pomeriggio. Sulla strada del Sempione comincia il rientro. Ognuno ha la sua giornata alle spalle.
FR
Dix-sept heures. Sur la route du Simplon, le retour commence. Chacun a sa journée derrière lui.
DE
Siebzehn Uhr. Auf der Simplonstrasse beginnt der Heimweg. Jeder hat seinen Tag hinter sich.
EN
Five in the afternoon. On the Simplon road the drive home begins. Everyone is coming off a full day.
line 2 0:09
IT
Il tragitto è corto e lo conosci a memoria. Sembra la parte più facile della giornata.
FR
Le trajet est court et tu le connais par cœur. On dirait la partie la plus facile de la journée.
DE
Die Strecke ist kurz und du kennst sie auswendig. Sie wirkt wie der einfachste Teil des Tages.
EN
The drive is short and you know it by heart. It looks like the easiest part of the day.
line 3 0:16
IT
Mille chilometri di autostrada vera, gli stessi conducenti: con poco sonno 535 uscite dalla corsia, altrimenti 66.
FR
Mille kilomètres de vraie autoroute : avec peu de sommeil, 535 sorties de voie. Les mêmes, reposés : 66.
DE
Tausend Kilometer auf offener Autobahn: mit wenig Schlaf 535 Spurabweichungen, sonst 66.
EN
A thousand kilometres of real motorway: on little sleep, 535 lane departures. After a normal night, 66.
line 4 0:27
IT
A predire gli errori era la sonnolenza, non il sentirsi esausti. Sono due cose diverse.
FR
Ce qui annonçait les erreurs, c'était la somnolence, pas l'épuisement ressenti. Deux choses différentes.
DE
Die Schläfrigkeit kündigte die Fehler an, nicht das Gefühl von Erschöpfung. Das ist nicht dasselbe.
EN
Sleepiness predicted the mistakes. Feeling worn out didn't. They are two different things.
line 5 0:34
IT
Le ore di veglia erano otto e i tratti brevi. Era bastata una notte corta.
FR
Huit heures d'éveil, des trajets courts. Une nuit écourtée avait suffi.
DE
Acht Stunden wach, kurze Etappen. Eine verkürzte Nacht hatte gereicht.
EN
They had been awake for eight hours and the drives were brief. One short night's sleep had been enough.
line 6 0:42
IT
Il sonno che hai perso è quello che ti fa sbandare. Dormi prima di ripartire.
FR
Le sommeil que tu as perdu, c'est lui qui te fait dévier. Dors avant de repartir.
DE
Der Schlaf, der dir fehlt, bringt dich von der Spur ab. Schlaf, bevor du weiterfährst.
EN
The sleep you lost is what makes you drift. Sleep before the next drive.
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At the end of a working day, how do you decide whether you are fit to drive?
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2026-10-03 · Drive Awake
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