If a species didn't sleep how else would they "recharge"?

Humans (and most animals) sleep. The reasons aren't really clear but most people believe:

Assuming a species had the same physical requirements (their brain had to offline for one reason or another) but didn't go comatose, hallucinate and suffer amnesia what other habits/patterns/routines could they evolve to serve the same function and allow normal cognitive functions?

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If a species didn't sleep how else would they "recharge"?

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