There are some that are topically applied, ingestible or breathable that could be put directly into their living environment. See if the Palai use anything calming recreationally since they're probably closer in physiology than humans are.
I didn't mean it as a long-term sort of answer, but I wasn't being flippant either.
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I didn't mean it as a long-term sort of answer, but I wasn't being flippant either.