about seven o'clock
We drank a little and flung ourselves down on the sand , thoroughly tired out , and soon were all asleep . There was no need to set a watch , for we had nothing to fear from anybody or anything in that vast untenanted plain . Our only enemies were heat , thirst , and flies , but far rather would I have faced any danger from man or beast than that awful trinity . This time we were not so lucky as to find a sheltering rock to guard us from the glare of the sun , with the result that about seven o'clock we woke up experiencing the exact sensations one would attribute to a beefsteak on a gridiron . We were literally being baked through and through . The burning sun seemed to be sucking our very blood out of us . We sat up and gasped .