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The morning window

Online · version of 01.10.2026 · on our channels on 02.11.2026

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At 10 am, many are at their peak. But a good time of day doesn't make up for a short night's sleep. Leave only if you've slept.

In mid-morning the two forces of sleep pull together: the need for sleep is low after the night, the body clock pushes towards the day, the brain has got going. It is the good hour for the long trip. On two conditions: having slept, and knowing that the peak does not come at the same hour for everyone.

In the video

  1. 0:00Ten o'clock
  2. 0:08The two forces
  3. 0:16Getting going
  4. 0:24Without the night
  5. 0:31The person
  6. 0:40The message

Details 55 s · 9:16 · four languages · generated images, voice and music, declared as such · 2026-09-09 · Drive Awake

What helps

If you can choose, the long trip goes in mid-morning: after the brain has got going (two to four hours after waking: Jewett 1999) and before the dip after lunch (episode 13). Night owls shift the window an hour or two later (Roenneberg 2003; Schmidt 2007). The good hour does not replace the night: those who slept little do not have one (Van Dongen 2003), and then the rules of the other episodes apply: stop, sleep ten minutes, get someone else to drive. And the peak passes: around four in the afternoon one of the three worst moments returns (Horne and Reyner 1995). With the circadian signal you can work out your trip: when you leave, how long you drive.

The video explained

5 scenes, with notes and sources
0:00 · Ten o'clock

It's 10 am. The sun is high over the lake. After a night's sleep, the body is close to its peak.

It is the curve of episode 04, seen from the other side. Alertness follows body temperature: it bottoms out shortly before dawn and climbs all morning (Wright 2002). By ten the climb is almost done. It is not a safe hour, because a safe hour does not exist: it is the hour when the body is on the driver's side. Provided it has slept.

Wright, Hull, Czeisler 2002 · DOI 10.1152/ajpregu.00205.2002

Watch this passage (0:00) →
The two forces · 0:08
0:08 · The two forces

Sleep pressure is low, while the body clock is pushing towards the day. For once, the two forces pull together.

Sleep has two forces. The first is the need for sleep: it grows with the hours spent awake and clears with sleep (the adenosine of episode 09). At ten, after a full night, it is at its lowest point of the day. The second is the body clock, which keeps us awake by day and pushes us to sleep at night: at ten it is rising. At night the two forces add up against the driver (episodes 03 and 04). In mid-morning they add up in the driver's favour. It is the widest window of the day.

Watch this passage (0:08) →
Getting going · 0:16
0:16 · Getting going

After waking, the brain takes two to four hours to get going. By 10 am, we're there.

Right after waking we are not immediately clear-headed: that is sleep inertia, and it fades slowly. Those who measured it on three consecutive days, in people getting up at their usual time, saw that it takes two to four hours to get back to full capacity; the feeling of being awake comes first, readiness later (Jewett 1999). Getting up, showering, having breakfast, switching on the light: none of it shortened the process. Whoever leaves at seven is still driving inside the inertia. By ten it is long gone. That is why the first trip of the morning is not the best one, even after a good night.

Watch this passage (0:16) →
Without the night · 0:24
0:24 · Without the night

Without a good night's sleep, there is no peak. Not even at 10 am.

The two forces pull together only if the night has cleared the need for sleep. Those who sleep little carry it through the day too, and the clock alone is not enough to cover it. Two weeks of six hours' sleep a night left readiness at the level of one or two nights without sleep; and the people living it said they felt only a little sleepy (Van Dongen 2003). It is the trap of episodes 08 and 09: the sleepiness you feel and the sleepiness that is there do not match. The ten o'clock peak is made the night before.

Watch this passage (0:24) →
The person · 0:31
0:31 · The person

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

The motorcyclist on the lake road has nothing to prove: he chose the hour. People who drive for a living often cannot choose: shifts, deliveries, timetables. Knowing the curve helps both. The first, to put the long trip in the good hour; the second, to know in which hours he can ask more of himself and in which he must stop (episodes 05, 06, 16). The motorbike is this episode's vehicle because it forgives a distraction less than anything else, and because at ten on a sunny day it is the most honest picture of full alertness.

Watch this passage (0:31) →

What changed in this text

2 corrections · the latest on 01.10.2026

The corrections made to this text, with their date, their reason and the lines they touched.

  1. 17.09.2026Native reading with a third engine (Google AI Mode)

    Two loan translations in German, and a missing referent

    A third engine read every line in its own language alone, without the others beside it: that is the test loan translations need, and the one cross-comparison cannot give. In German «besetzt seinen Platz» echoed the Italian «ne prende il posto» (German says «nimmt seinen Platz ein»), and «die Summe nimmst du mit ins Bett» was the same loan translation we had already fixed in French on 16 September. In hour 09 the coffee line did not say what it was about: German and English named the coffee, Italian and French did not. All four name it now. The other languages followed: in French «deux, six et seize heures» dropped the word «heures» from the first two, which Italian allows and French does not, and «comme en plein jour» places an action in time rather than describing how someone drives; in English «the body asks for sleep» echoed «chiede il sonno» and becomes «calls for». Italian had no loan translations at all: it is the language the lines are written in.

    Lines touched FR line 4

  2. 01.10.2026New version of the 10 am, 9 am and 8 am episodes

    10 am, 9 am and 8 am: six boards and the corrected lines in the videos

    Three hours already online go back into the edit, and with them come the lines corrected after the first release. Hour 08 gets two revised French lines, two revised German lines and three English lines by George. Hours 09 and 10 get George's English lines and, in hour 10, one French line. Episodes 09 and 10 go from eleven and eight boards respectively to six: we keep lines that were already there and write no new ones.

    Lines touched EN line 2, FR line 4, EN line 4, EN line 5, EN line 6

Revisions that concern the whole series are in the campaign diary →

Every line, in all four languages →

The text, in all four languages

6 lines

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 →

  1. line 1 0:01

    IT

    Sono le dieci. Il sole è alto sul lago. Dopo una notte di sonno, il corpo è vicino al suo massimo.

    FR

    Il est dix heures. Le soleil est haut sur le lac. Après une nuit de sommeil, le corps est proche de son maximum.

    DE

    Zehn Uhr. Die Sonne steht hoch über dem See. Nach einer Nacht Schlaf ist der Körper nahe an seinem Hoch.

    EN

    It's 10 am. The sun is high over the lake. After a night's sleep, the body is close to its peak.

  2. line 2 0:09

    IT

    Il sonno chiede poco, l'orologio spinge verso il giorno. Le due forze, per una volta, remano insieme.

    FR

    Le sommeil demande peu, l'horloge pousse vers le jour. Pour une fois, les deux forces tirent dans le même sens.

    DE

    Der Schlaf fordert wenig, die innere Uhr drängt in den Tag. Für einmal ziehen beide am selben Strang.

    EN

    Sleep pressure is low, while the body clock is pushing towards the day. For once, the two forces pull together.

  3. line 3 0:17

    IT

    Dopo la sveglia il cervello ci mette da due a quattro ore a ingranare. Alle dieci, ci siamo.

    FR

    Après le réveil, le cerveau met de deux à quatre heures à se mettre en route. À dix heures, on y est.

    DE

    Nach dem Aufwachen braucht das Gehirn zwei bis vier Stunden, bis es läuft. Um zehn ist es so weit.

    EN

    After waking, the brain takes two to four hours to get going. By 10 am, we're there.

  4. line 4 0:25

    IT

    Senza una notte di sonno il picco non c'è. Nemmeno alle dieci.

    FR

    Sans une nuit de sommeil, pas de pic. Pas même à dix heures.

    DE

    Ohne eine Nacht Schlaf gibt es kein Hoch. Auch nicht um zehn.

    EN

    Without a good night's sleep, there is no peak. Not even at 10 am.

  5. line 5 0:32

    IT

    Chi può scegliere quando partire, parte adesso. Chi non può scegliere, almeno lo sa.

    FR

    Qui peut choisir l'heure du départ part maintenant. Qui ne peut pas choisir le sait, au moins.

    DE

    Wer wählen kann, wann er losfährt, fährt jetzt. Wer keine Wahl hat, weiss es wenigstens.

    EN

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

  6. line 6 0:41

    IT

    Alle dieci molti sono al meglio. Ma l'ora buona non recupera una notte corta: parti solo se hai dormito.

    FR

    À dix heures, beaucoup sont au mieux de leur forme. Mais la bonne heure ne rattrape pas une nuit trop courte : ne pars que si tu as dormi.

    DE

    Um zehn sind viele in Bestform. Aber die gute Tageszeit holt eine zu kurze Nacht nicht auf: Fahr nur los, wenn du geschlafen hast.

    EN

    At 10 am, many are at their peak. But a good time of day doesn't make up for a short night's sleep. Leave only if you've slept.

Transcript
  1. 0:02 It's 10 am. The sun is high over the lake. After a night's sleep, the body is close to its peak.
  2. 0:10 Sleep pressure is low, while the body clock is pushing towards the day. For once, the two forces pull together.
  3. 0:17 After waking, the brain takes two to four hours to get going. By 10 am, we're there.
  4. 0:25 Without a good night's sleep, there is no peak. Not even at 10 am.
  5. 0:33 If you can choose when to leave, leave now. If you can't, at least you know.
  6. 0:41 At 10 am, many are at their peak. But a good time of day doesn't make up for a short night's sleep. Leave only if you've slept.

Captions IT FR DE EN

A question about this hour · 10:00

At what times of day is your attention at the wheel at its best, and how can you tell?

There is no right answer: we are interested in the experience of people who drive, including for work.

The conversations happen on our channels. When there is one about this hour, we will link to it here.

Reply on our channels: Instagram Facebook LinkedIn YouTube TikTok Telegram

Online · always open to reports

This episode is online. If something feels off, a word, a figure, a detail in the image, tell us below: two lines are enough. We read everything, and every correction goes into the diary, with its date.

Tell us what you noticed

We read every message. If it becomes a correction, the text changes here on the site and goes into the episode's diary, with its date and its reason. Corrections already made →

Details, if you like
We keep nothing beyond what you write here.

Sources

  • Wright KP Jr, Hull JT, Czeisler CA. Relationship between alertness, performance, and body temperature in humans. Am J Physiol Regul Integr Comp Physiol 2002;283:R1370-R1377. DOI: 10.1152/ajpregu.00205.2002 laboratory
  • Jewett ME, Wyatt JK, Ritz-De Cecco A, Khalsa SB, Dijk DJ, Czeisler CA. Time course of sleep inertia dissipation in human performance and alertness. J Sleep Res 1999;8:1-8. DOI: 10.1111/j.1365-2869.1999.00128.x laboratory
  • Horne JA, Reyner LA. Sleep related vehicle accidents. BMJ 1995;310:565-567. DOI: 10.1136/bmj.310.6979.565 road
  • Roenneberg T, Wirz-Justice A, Merrow M. Life between clocks: daily temporal patterns of human chronotypes. J Biol Rhythms 2003;18:80-90. DOI: 10.1177/0748730402239679 laboratory
  • Schmidt C, Collette F, Cajochen C, Peigneux P. A time to think: circadian rhythms in human cognition. Cognitive Neuropsychology 2007;24:755-789. DOI: 10.1080/02643290701754158 laboratory
  • Van Dongen HPA, Maislin G, Mullington JM, Dinges DF. The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation. Sleep 2003;26:117-126. DOI: 10.1093/sleep/26.2.117 laboratory

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2026-09-09 · Drive Awake