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The question when making competitive rulesets shouldn't be "how many things can we possibly allow?", it should be "what can we allow and still have a fun, healthy metagame?".
Unrestricted sleep would be ridiculously overcentralizing.
Nobody says it's unbeatable, but with the continuing power creep in the series, many matches are basically already decided at match-up, so introducing another busted aspect into the meta that every team needs to prepare for would only worsen that problem.