How Marine Animals Sleep Without Drowning

Explores the remarkable ways marine animals manage to rest while living underwater. Because sleep is essential for survival, many species have evolved unique adaptations. Whales and dolphins, for example, practice unihemispheric sleep — shutting down only half of their brain at a time so they can remain alert and continue breathing. Seals and other pinnipeds use flexible sleep patterns depending on whether they are on land or in water, while some fish, like parrotfish, protect themselves by forming mucus cocoons as they rest. Even simple organisms such as jellyfish display sleep-like states, suggesting that the need for rest emerged very early in evolutionary history. Using advanced tools like EEG monitoring and fluorescent imaging, scientists continue uncovering how life beneath the waves finds ingenious solutions to recharge and survive.

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