Isobel by James Oliver Curwood

After his return from the scene of burial Billy undressed, put out the light, and went to bed. He fell asleep quickly, and his slumber was filled with many dreams. They were sweet and joyous at first, and he lived again his first meeting with the woman; he was once more in the presence of her beauty, her purity, her faith and confidence in him. And then more trouble visions came to him. He awoke twice, and each time he sat up, filled with the shuddering dread that had come to him at the graveside.

A third time he awakened, and he struck a match to look at his watch. It was four o'clock. He was still exhausted. His limbs ached from the tremendous strain of the fifty-mile race across the Barren, but he could no longer sleep. Something -- he did not attempt to ask himself what it was -- was urging him to action. He got up and dressed.