Perhaps he dozed.

At any rate, the whisper which called him back to realization of where he was, came to him so unexpectedly that he sat up with a sudden start.
Morrison's eyes were open, he had raised himself on his elbow, his lips were parted.

His manner was quieter, but there were black lines deep engraven under his eyes, in which there still shone something of that haunting fear.
"Laverick!" he repeated hoarsely.
Laverick, fully awakened now, leaned towards him.
"Hullo," he said, "are you feeling more like yourself ?" Morrison nodded.
"Yes," he admitted, "I am feeling--better.

How did you come here?
I can't remember anything." "You sent for me," Laverick answered.

"I arrived to find you pretty well in a state of collapse.