If sharks sink when they stop moving, do they ever rest?

This means that sharks are possibly able to shut off parts or most of their brain to "rest" while they keep swimming(seems similar to how dolphins will shut off half their brain at a time). Even then there are some places, such as the caves off of Isla Mujeres are places for sharks that dont normally stop swimming to stop and take a rest. read more

The idea that sharks will drown if they stop swimming is a common one, but it's not entirely true. There are two main ways sharks go about breathing. Ancient shark species breathed through a method called buccal pumping, which some of today's sharks still use. read more

Most of them don't die if they stop moving. Only about 21 have to keep moving because they are obligate ram ventilators, which means they have to swim to breathe. read more