Correct answer
The overnight hours, for example 03:00–05:00.
The overnight hours, for example between 03:00 and 05:00, are a period of greater sleep propensity; the early afternoon is another. Avoid planning driving in these periods and get enough sleep. If drowsiness occurs, stop somewhere safe and rest: cabin ventilation does not replace sleep. Drowsiness can occur at any time.
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Only midday, because drowsiness never occurs in the overnight hours.
The overnight hours, for example 03:00–05:00.
No period: sleep rhythm cannot have any influence.
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