I heard in a podcast
ってことは、たったままでねるってこと
I think it means something like "So that means you can sleep while standing?" but I'm not sure what the ってこと is doing here. The first one I get it's similar to つまり or am I wrong?
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「ってことは、たったままでねるってこと。」
「ってことは」 is an informal form of 「ということは」. Other informal forms include 「つうことは」、「ちゅうことは」, etc.
When one of these expressions is used to start a sentence, its function is to rephrase and/or summarize what has already been stated.
It is synonymous to 「つまりは」 or 「結局{けっきょく}は」. The English counterpart would be "So that means ~~" or "That is to say ~~"
"So that means you/they/we/I sleep standing up."
