Wanted: trustworthy animal for night-time position. Must be nimble and reliable... Whenever Ava can' t sleep, she counts sheep. But Ava takes so long to fall asleep, i' s the sheep who are growing tired - until, finally, they quit! When the sheep promise to find a replacement that Ava can count on, chaos ensues as chickens, cows, pigs, hippos and more try their hand at jumping over Av' s fence. Finding the perfectly peaceful replacement for sheep might not be so easy after all.