What organs or modifications would be needed for a life biological creature not to require sleep?

I mean literally not sleeping for the rest of their life, not like giraffes that only require short rests, or dolphins that can sleep with half of their brain at a time, or like otters and sharks that sleep walk.

An external solution like drinking caffeine or using other drugs is out of the question.

I don't mind, however, if one of the creature's organs can produce caffeine or another chemical that allows the creature to never sleep, but please elaborate on how it would work instead of merely hand-waving it.

(I use science fiction tag because it may not possible for science-based answer, but much appreciate if it really possible in real science)

what organs need or developed for a life biological creature to never need to sleep?

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What organs or modifications would be needed for a life biological creature not to require sleep?

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