They load their camels very early in the morning and journey until the sun is well up, when both air and sand become impossibly hot. Then they stop, unload and hobble the camels, unpack the baggage and erect their tents for shade. In the afternoon when the sun begins to drop they depart and travel deep into the night when they camp until early morning, then begin the day again. Thus is the habit of travellers from Sudan, to whom the sun’s rays can be deadly if falling vertically upon them.
-Muhammad al-Idrisi, The Pleasure of Him Who Longs to Cross the Horizons
This is a good summary of our habits too on the Darb, written seven hundred years before our own time. Although we had no tents we did seek shade under trees, fearing the same deadly rays of the sun that shine from directly overhead.