Correct answer
During the pre-dawn hours and early afternoon.
During the pre-dawn hours and early afternoon because of the biological sleep rhythm. A meal is not necessary for the afternoon dip in alertness. Insufficient rest, personal schedules and other factors also matter: being outside these periods does not guarantee alertness. If drowsy while driving, stop somewhere safe and rest.
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Only at night, never in the afternoon.
During the pre-dawn hours and early afternoon.
Only after a meal, never because of the biological rhythm.
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