The sleeper shark is a family of slow-moving, deep water predators found all over the world, from the northern pole to the southern Indian and Paci...

The sleeper shark has an enormous bite force and sharp teeth, but it has not been known to attack people.

The sleeper shark is thought to make rather sluggish movements in the water. The name doesn’t actually have anything to do with sleep.

The largest species, the Greenland shark, can reach a length of around 20 feet. Most species, however, only ever reach a few feet long.

Most species can live for dozens of years, but the Greenland shark is estimated to have a lifespan of up to 500 years of age.

Sleeper sharks live just beneath the top sunlight layer during the day and come to the surface at night. Of course, this behavior can vary by speci...