Just about every creature on Earth needs to grab some Zs from time to time. Imagine trying to doze while dodging great whites and killer whales.
Articles on animal sleep
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Colour-changing patterns in snoozing octopuses are characteristic of two alternating sleep states.
Pond snails use things like rocks or the side of their aquarium as their bed, attaching themselves while they sleep. This might not seem very relaxing but their shells do hang away from their body.
Top contributors
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Assistant researcher, The University of Melbourne
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Senior Lecturer in Sleep Ecophysiology, La Trobe University
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Research Fellow in Comparative Psychology, University of Cambridge
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Executive Dean of the College of Arts, Sciences & Education and Professor of Biological Sciences, Florida International University