How to Make Sleeping Gas?

Sleeping gas, like that is used in book, movies and on TV, is a fictional substance. There are some gasses that would do this to a person, but It would be dangerous and sometimes illegal to use this at home. We get knocked out because it is poison to our body. Car exhaust is carbon monoxide and makes people go to sleep and then die if they do not get fresh air. You can find more information .
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