In Iceland, the sharks are hunted for food. They let them rot for months to eliminate the poisonous anti-freeze these sharks have to survive in the cold temperatures they live in. They are then safe to eat.  These are known as Hákarl. These are a poorly studied type of deep-sea shark.
Somniosidae can be found in the following areas:
- Arctic to subantarctic waters
- all oceans
- shelves in cold waters
- continental and slopes
- temperate and tropical waters
Sleeper sharks may feed on Colossal squid.
- Centroscymnus Barbosa du Bocage & Brito Capello, 1864
- Centroselachus Garman, 1913
- Proscymnodon Fowler, 1934
- Scymnodalatias Garrick, 1956
- Scymnodon Barbosa du Bocage & Brito Capello, 1864
- Somniosus Lesueur, 1818
- Somniosus antarcticus Whitley, 1939 (Southern sleeper shark)
- Somniosus longus (Tanaka, 1912) (Frog shark)
- Somniosus microcephalus (Bloch & J. G. Schneider, 1801) (Greenland shark)
- Somniosus pacificus Bigelow & Schroeder, 1944 (Pacific sleeper shark)
- Somniosus rostratus (Risso, 1827) (Little sleeper shark)
- Zameus D. S. Jordan & Fowler, 1903
- Froese, Rainer, and Daniel Pauly, eds. (2011). "Somniosidae" in FishBase. February 2011 version.
- Simon, Matt. "Footnotes: Lazy Sharks, Humiliated Seals, and Googlers Eating Dog Food | Wired Opinion". Wired.com. Retrieved 2012-07-05.
- "Abstract". Springer Links. Retrieved 29 December 2012.
- "Family Somniosidae - Sleeper sharks". Fish Base. Retrieved 29 December 2012.
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