Assertion: sea otter | /r/CapableOf | sleep on the water
Facets:
Source sentences:
text: Sea otters, as opposed to river otters, eat and sleep on the water, wrapping their buoyant bodies in seaweed to keep from drifting while they nap.
text: In summer, when sea otters spend almost all their time in the sea, the way they sleep on the water looks very touching.