《Cheer Up Sleepy Jean》的詞曲由歌曲的演唱者——五人女子組合Oh My Girl在2020年推出的迷你三輯《Closer》中完成。歌詞如下：
Verse 1:
Come on wake up wake up wake up
Oh my god it's a beautiful day
Let's go let's go let's go
It's time to live your life
Chorus:
Cheer up sleepy jean
You're the star of the day
Let's dance in the sunshine
Don't be sad, it's okay
Verse 2:
You've been dreaming all night long
But now it's time to wake up
You're the best version of yourself
No need to be afraid
Chorus:
Cheer up sleepy jean
You're the star of the day
Let's dance in the sunshine
Don't be sad, it's okay
Bridge:
You know you're beautiful
And no one can take that away from you
So let yourself shine today
And make every moment count
Chorus:
Cheer up sleepy jean
You're the star of the day
Let's dance in the sunshine
You're gonna love yourself today
Outro:
You are perfect just the way you are
So why not let yourself be free?
Take a deep breath and smile at yourself
Because today is a beautiful day.