I have seen that the Dev-Team tries a lot to improve the expressions of Hearthlings. Only a suggestion… You can try to make more expressions using the eyes of the Hearthlings. Sometimes little changes can make a big difference. I tried it quick with this examples. Some of them don’t need any description how our Hearthling is feeling right now 
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love this idea. it has always irked me that hearthlings dont sleep with their eyes closed >.<
nice idea.
maybe also put a X X when they are unconscious 