sleeping on a sea voyage; falling asleep to ocean sounds
Poetic noun evoking the image of using the waves as a pillow while traveling by boat, or drifting off to the sound of the sea.
On the night of the sea voyage, I fell asleep with the waves as my pillow.
At an inn near the shore, I spent a night falling asleep to the sound of the waves.
Compound of 波 (wave) and 枕 (pillow). The exact origin is uncertain, but it is a poetic coinage evoking the image of resting one's head on the waves.