Squink
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Chemical warfare is the usual approach, but I suppose nukes would work as well ;).
Why not just ask them to leave?
It looks like AlbertRose’s OP was eaten by the server, but I guess the question speaks for itself.
This Staff Report may be of interest: What’s the origin of the expression, “sleep tight”?
I’m not sure you really want open containers of kerosene in your bedroom, though.