The Secret World of Animal Sleep: Sleepless on the Savanna

  • 3m
  • 4K
  • TV-G

In the animal kingdom, the higher up the food chain you are, the more sleep you get. That's why prey species like giraffes can only afford mere minutes of sleep at a time, while lions revel in over 20 hours of luxurious slumber a day. Take an eye-opening look at sleep as a survival strategy.