Sharks Sleep

Scientists have research on sharks that don't need to swim all the time. It seems like these sharks, they can sleep when they stop moving. But for the rest of the sharks that need to be continuously swimming all the time, we still don't know if they sleep. One theory is that sharks, they sleep in currents. And then there's another kind of wacky idea that sharks do sleep and they might be able to do so through something called vertical migration.