IU recently appeared on JTBC‘s Famous Singer where she shared the hidden meaning behind her song, “Knees”.

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She introduced the 2015 song as one of the most honest songs that she wrote without getting into character or worrying about her pitch.

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But many were surprised to find out that the song is actually about her insomnia.

One day, I wondered why I couldn’t sleep and tried to think of when I could fall asleep the most naturally. That’s when I realized that I slept best when I laid my head on my grandmother’s lap and she stroked my hair.

— IU

She also added that she gets extra emotional when she sings the song on stage.

I always get so into it that I sing it with my eyes closed.

— IU

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And when asked about the current state of her insomnia, IU revealed that she still has trouble sleeping.

There are times when I can sleep and times when I can’t sleep at all.

— IU

But according to IU, she has found a method to deal with her insomnia.

It’s best to just give up on sleep. If you obsess over why you can’t sleep, you’re bound to be miserable. So I just think, ‘Wow, I have so much time now. I’d better work.’

— IU

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Although it’s not a method that allows IU to get proper sleep, IU chose to keep a certain mindset that keeps her optimistic.

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Check out the full confession below: