Maarten is correct. See another reply from a previous question on this very topic: sans-reveil
I hope this is helpful.
Bonne journée !
Difficult to give a comment without sight of the full text context that you are querying.
Could you quote the text, please?
It is to do with 'sans' - no article required/used with general expressions 'sans quelque chose', only if referring to 'without a specific thing'.
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