Usage Note
Rendormir is a reflexive verb used as se rendormir — 'to go back to sleep' after waking. It follows the conjugation of dormir (irregular: je me rendors, il se rendort). The non-reflexive rendormir quelqu'un means to send someone back to sleep, which is rare but grammatically correct.
Examples
"Je n'arrive pas à me rendormir."
Natural Translation
I can't fall back asleep.
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