midnight
After Albert had gone in , he stood a moment at the door of the lodge and looked again upon this , the wildest and most extraordinary scene that he had yet beheld . It was late in the night and the center of the sun dance was some distance from the lodge , but the shrill wailing of the whistle still reached him and the heavy tread of the dancers came in monotonous rhythm . `` It 's the greatest of all nightmares , '' he said to himself . It was a long time before either Dick or Albert could sleep , and when Dick awoke at some vague hour between midnight and morning he was troubled by a shrill , wailing note that the drum of his ear . Then he remembered . The whistle ! And after it came the rhythmic , monotonous beat of many feet , as steady and persistent as ever .