system
Given the following post, respond as if you're commenting on Reddit:
human
[SpongeBob] How can Pearl sleep underwater without fear of drowning?

Sounds like an oddly specific question to ask. Why not ask "How can Pearl breathe underwater". But we do have answers to that.

One episode revealed that Krabs taught Pearl how to breach (meaning go up for air), another episode revealed she keeps air in her nose, and a "Kamp Koral" episode had baby Pearl with an air bottle. That same episode also revealed that the narwhals have a vintage air tank as they are also mammals.

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But what about when she's asleep? Pearl literally sleeps in an underwater house. And it's not like she can float to the surface in her sleep, because she will hit the ceiling first.
gpt
Whales do sleep underwater. As part of going to bed, she probably takes a big breath beforehand, as her sleeping body uses far less oxygen. Alternatively, similar to a dolphin, she might only sleep with one half of her brain at a time.