Question

which fish sleep with one eye open​

Answer 1

Answer:

Because they need to periodically come up for air and keep an eye out for potential predators, dolphins can't curl up and zonk out at night like land mammals can. So they must stay somewhat conscious and sleep with the proverbial one eye open

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Answer 2

$\small\mathsf\blue{Dear \: user,}$

$\small\mathsf\red{There \: is \: a \: fact \: that \: fishes \: didn't \: close \: their \: eyes \: even \: they \: were \: dead}$

$\small\mathsf\purple{You \: have \: to \: know \: that \: dolphins \: sleep \: with \: the \: proverbial \: one \: eye \: open}$

$\small\mathsf\pink{Note \: :-}$$\small\mathsf\orange{Dolphins \: are \: not \: Fishes \: they \: are \: Mammals}$