Would mermaids be able to sleep?

If a mermaid was a fully mammalian creature that split on the evolutionary chain about the same time as humans did, would it be likely that mermaids could sleep? Would they rest one half of their brain at a time like a dolphin? Could they pass out?

Bonus question: Does it make more sense for the legs to evolve into the tail, or for the legs to shrink and for the spine to elongate to support the tail?

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Would mermaids be able to sleep?

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