If it's only one or two stunned aliens that could really cause trouble, place a soldier on the same spot (soldier standing on the tile where the unconscious alien is lying). I have only tried that a handful of times, but as far as I know, it prevents them from getting up.
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A sickened, sensitive shadow writhing in hands that are not hands, and whirled blindly past ghastly midnights of rotting creation (Nyarlathotep, H.P. Lovecraft)
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