Knocked out NPC's in beds shouldn't cause other NPC's to be alarmed.
Probably something awkward to implement but a nice immersion touch [imo.]
Having seen NPC's sleeping on bedrolls and beds I thought i'd try knocking them out and leaving them on the bed or putting KO'd NPCs on a bed as if they where sleeping. Other NPC's who walked past though immediately where alerted at the KO'd body even though there was no evidence I had been there. It would be a nice touch if they carried on walking/passed a remark about being lazy or something without being alerted.