Mammalian sleep habits have been extensibly studied and show that the larger the animal, the less it sleeps. Elephants sleep a few scant hours a day while smaller mammals sleep more, such as the domesticated cat which sleeps in excess of 18 hours a day. Some links:
http://www.scientificamerican.com/article.cfm?chan ID=sa003&articleID=00042C19-D5B3-11B4-95B383414B7F 0000
http://www.sleephomepages.org/sleepsyllabus/fr-b.h tml
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Mammalian sleep habits have been extensibly studied and show that the larger the animal, the less it sleeps. Elephants sleep a few scant hours a day while smaller mammals sleep more, such as the domesticated cat which sleeps in excess of 18 hours a day. Some links: http://www.scientificamerican.com/article.cfm?chan ID=sa003&articleID=00042C19-D5B3-11B4-95B383414B7F 0000
http://www.sleephomepages.org/sleepsyllabus/fr-b.h tml