Detroit Zoo on Twitter: "It's no tall tale: Not only can giraffes sleep standing up, but they sleep for less than five minutes at a time, only a handful of times per
African Giraffes' Sleeping Patterns has been of special interest to biologists
The Unique Sleeping Habits of Giraffes - Safari Ventures
Giraffe guide | BBC Wildlife Magazine | Discover Wildlife
How giraffes sleep.. : r/aww
10 Fun Facts About Giraffes - WorldAtlas
This Is How Giraffes Sleep (13 pics) | Bored Panda