Eat that, fan-death believers.
In fact, astronauts, who sleep in the most hermetic spaces you can think of, actually need fans to survive sleep:
Fans are necessary in zero G environments where the exhaled gasses of different densities do not rise or fall away from the person breathing. Sleeping on the International Space Station without a fan or ducted airflow will cause asphyxiation after an extended period of time.
—Wikipedia article on fan death
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