Learn the tone, meaning, and better English alternatives around "i can't sleep" with real scene examples.

It means the speaker feels too tense to relax until a problem is solved.
From In Love With My Godfather's Daughter, Episode 25
Someone says they cannot sleep until the mission is finished.
Use this when you are stressed about an unfinished task or danger. It is understandable, but the specific wording here is plot-heavy.
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