"Gray seal (Halichoerus grypus) is active during the day and primarily sleeps at night. They can sleep vertically in the water with their heads raised above the surface or even completely submerged underwater for 20-30 minutes at a time."

"Domestic goats (Capra hircus) are diurnal animals that are most active in the morning and evening. They will take short naps during the day, but these ruminant animals usually sleep at night for up to 5 hours within a 24-hour period."

"Although they may be the tallest animals on this earth, giraffes (Giraffa spp.) have the shortest sleep time compared to any mammal. Within a 24-hour period, giraffes typically sleep for about 4 hours. Giraffes sleep in short cycles of up to 35 minutes, especially at night, with most daytime naps averaging only about 5 minutes at a time."

The subspecies of domesticated and wild donkeys (Equus asinus) generally sleep for about 3 hours per 24-hour period. These animals tend to sleep in groups at night, and individuals take turns watching for threats.

In the wild, the African elephant (Loxodonta africana), which is very large and majestic, only needs 2 hours of sleep in a 24-hour cycle. Most elephants sleep at night, although they also take short naps during the day. Highly social and living in close-knit family units, African elephants take turns sleeping to ensure protection from opportunistic nocturnal predators.