| Mammal | Hours of Sleep Required per 24-Hour Period |
| Giant sloth | 20 | ||
| Opossum | 19 | ||
| Koala | 18 | ||
| Wild lion | 16 | ||
| Mouse | 13 | ||
| Jaguar | 10 | ||
| Chimpanzee | 9 | ||
| Human, rabbit, pig, rhinoceros | 8 | ||
| Gray seal, dolphin | 6 | ||
| Cow, goat, donkey, sheep | 3 | ||
| Horse, elephant | 2 | ||
| Giraffe | 20 minutes | ||
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