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I thought that dolphins could avoid having to sleep while travelling long distances by having part of the brain asleep and then switching when tired.

I could just be misremembering things, so I’m not certain.

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Each half sleeps alternately. Perhaps sleeping in water as a mammal requires mich more processing power.

Breathing is also a conscious action for them if I remember right

Dolphins need to come to surface to take air so you may be right. I also remember reading about how dolphins sleep and I remember there were 3 parts of the brain that were alternating sleep to make breathing possible.

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