how long can a giraffe sleep?
For the deepest sleep, walruses will either hook their tusks onto a stable piece of ice or move to land. Walruses can sleep up to 19 hours at one time. Unlike most animals, walruses do not need to sleep every day, and they can swim without stopping to sleep for more than three days. Giraffes. Giraffes need less sleep than any other mammal. According to the Smithsonian publication, Zoogoer, giraffes sleep for five minutes at a time, adding up to an average of 30 minutes per day.