Think we've been to sleep long ?" "I don't know.

Perhaps.

There's only one way to find out: go to the mouth of the hole." "Yes--that's the only way," said Vince; "and now the use of the candle comes in.

I don't know, though: it seems a pity to light the last bit.
Shall we go and see ?" Mike suppressed a shiver of dread, and said firmly,--"Yes." Another point arose, and that was as to whether they should put on their clothes again.
It seemed a pity to do so and again get them wet; but both felt repugnant to attempting to wade back without them, and they began to feel about, half in dread lest the seals which had visited them in the night should have chosen their clothes for a sleeping place.
They were, however, just as they had been left, and, to the astonishment of both, they were nearly dry.
"Why, Mike," cried Vince, "we must have slept for hours and hours." "We can't.

The cave's warm, I suppose, and that accounts for it.