Various variants have rules for this. Poschengband has the whole Ninja mechanic, O Assassins are much better in combat against sleeping enemies and have very quiet fighting, Rogues have some bonuses as well. Sil has both monsters waking each other up and attack-from-stealth abilities, making for interesting situations.
As far as I can tell, V has nothing of the sort, with the possible exception of noise from combat being affected by stealth.
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