Zhuangzi's Butterfly

Origin
The dream argument is the postulation that the act of dreaming provides preliminary evidence that the senses we use to distinguish reality from dreams should not be fully trusted. Therefore any state that is dependent on our senses should be carefully examined and rigorously tested to determine whether it is in fact reality. When people dream they usually do not realize they are dreaming which led to the thought if one could be dreaming constantly, instead of being in a waking reality. One might Zhuangzi (369 BC) dreamed that he was a carefree butterfly. When he woke he pondered if he was really himself or actually a free butterfly dreaming that it was him. This was a metaphor for what he referred to as a "great dream"

"He who dreams of drinking wine may weep when morning comes; he who dreams of weeping may in the morning go off to hunt. While he is dreaming he does not know it is a dream, and in his dream he may even try to interpret a dream. Only after he wakes does he know it was a dream. And someday there will be a great awakening when we know that this is all a great dream. Yet the stupid believe they are awake, busily and brightly assuming they understand things, calling this man ruler, that one herdsman ‑ how dense! Confucius and you are both dreaming! And when I say you are dreaming, I am dreaming, too. Words like these will be labeled the Supreme Swindle. Yet, after ten thousand generations, a great sage may appear who will know their meaning, and it will still be as though he appeared with astonishing speed." - Zhuangzi (Published by New York: Columbia University Press, 1996)

Effects
When released it lands on victim causing deep sleep with amazing, life-like dreams. Hard to wake victim up from.

Collection
The Butterfly was discovered by a night nurse who discovered a lot of terminal patients had gone into comas. It was unknown who released the butterfly into the hospital wing or how the nurse was able to catch it in the jar. Butterfly never seems to die.