The sea isn't a blanket. Sure, blankets may have waves, and blankets ripple when you jump on them, but a blanket does not host Atlantis. A blanket isn't full of saline. A blanket does not hold billions of creatures underneath it. Instead, a blanket only holds a couple, snoring, unconscious, unaware of the each other, unaware of their petty troubles, unaware of their drunkenness, unaware of their bruises, unaware of life, death, and the sea.