Dolphins sleep with half a brain at a time — one hemisphere rests while the other keeps them breathing, moving and alert. A researcher guessed this from their habit of sleeping with one eye open in 1964; EEG recordings in the 1970s proved the strange arrangement was real.
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A 1964 one-eye-open observation inspired the idea, but EEG work published in 1975–77 showed how dolphins alternate genuine slow-wave sleep between hemispheres.
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