This was comfort and safety.

They were only a pin point in the wilderness, but for the present the stony hollow fenced them about, and the hidden fire gave forth warmth and pleasure.
"Do you think you could sleep, Paul ?" asked Henry, when they had put on again the last of the dried clothing.
Paul laughed.
"Could I sleep ?" he said.

"Would a hungry wolf eat?
Will water run down hill?
I don't think I could do anything else just now." "Then try it," said Henry.

"After a while I'll wake you up for your watch, and take a turn at it myself." Paul said not another word, but sank back on the grass and leaves, with his feet to the great bed of coals.

He saw their glow for a moment or two, then his eyelids shut down, and he was wafted away on a magic carpet to a dreamless region of happy peace.