The language code used here correspond to the ISO 639-1 standard :
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To propose a page to be translated, type below after the slash ('/') the name of the article in English and follow the instructions.
Interest of the translation: There is very little (five lines) information about non-human sleep on the English Wikipedia. The article in Swedish is well referenced, and of appropriate length. Further reasoning can be found at Talk:Sleep#Sömn hos djur (Sleep in non-humans)