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Re:How do whales and dolphins sleep without drowning? by hwillis on Sunday July 02, 2017 @07:31PM (#14684850)
Directly: https://en.m.wikipedia.org/wiki/Inert_gas_asphyxiation

You are totally unaware of your brain shutting down as the oxygen level decreases. People lose the ability to do arithmetic or simple puzzles including blocks in holes, but by the time that happens youre too far gone to recognize what that means.

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