1: The Bullfrogs sleep only when necessary to conserve energy.
2: Alaskan Salmon do not sleep during their migration journey.
3: Green Sea Turtles sleep by resting half their brain at a time.
4: Some breeds of Sharks must keep moving to breathe.
5: Ants take power naps throughout their workday.
6: Alpine Swifts can fly continuously for months.
7: African Elephants sleep less than four hours a day.
8: Giraffes sleep for short periods standing up.
9: Horses sleep only 2.9 hours per day in short intervals.
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