
Sleepy: Surprising Ways Animals Snooze
Jennifer Ward
When dolphins sleep, half their brain stays awake. Snakes sleep with their eyes open. Giraffes sleep in five-minute intervals, while koalas sleep for twenty-two hours a day!

Jennifer Ward
When dolphins sleep, half their brain stays awake. Snakes sleep with their eyes open. Giraffes sleep in five-minute intervals, while koalas sleep for twenty-two hours a day!