White-capped waves dashed against the boat.

It was unusually rough for a lake of its size.

She inhaled deeply the strong, bracing air, until, discovering that she was getting wet from the spray, the girl hurried below and crawled into her cot, shivering a little.
Then she fell into a deep sleep, soothed by the rocking of the boat.
Tommy was moaning in her sleep.

The others appeared to be sleeping soundly.

It was late in the night when Harriet was awakened by a terrific crash.