IU just revealed behind-the-scenes footage of her time with Yoo Hee Yeol’s Sketchbook, but a confession she made regarding how tired she was has fans worried.

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In the shared footage, IU was in the studio practicing for her performances.

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And although she looked hyped, her condition didn’t look so good.

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IU confessed that she’s been suffering from insomnia.

The season of insomnia has returned. I can’t sleep these days. So my voice won’t come out. I’m in such a good mood, but my voice won’t come out. I’m just being a baby.

— IU

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When a composer in the studio showed their concern for IU’s insomnia, IU expressed,

I wish someone could just hit me in the head, instantly making me faint.

— IU

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She worried fans by continuing to share that she can’t fall asleep even after rehearsals.

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Even on the day of recording for Yoo Hee Yeol’s Sketchbook, IU spoke up about her difficulty with sleeping.

You might think I look less energetic than usual. It’s not that my condition is bad. It’s just that I didn’t sleep. I’m good as long as I get good sleep. I’m strong. And that was fun. Don’t worry about me.

— IU

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Check out the full vlog below: