A thrilling battle between a sleepy soul and the demon of sleepiness!

In Japanese, this phrase is written as: (Hayaku Kita) (Nemuri Oni to no Tatakai)

Here's a breakdown:

* (Hayaku Kita) means "to wake up" or "to rise quickly"
* () is the word for "sleepy" or "drowsy", and ()
is the demon of sleepiness. Nemuri Oni is a mythical creature that represents the embodiment of sleepiness.
* (Tatakai) means "battle" or "fight"

So, when you say , it's like saying, "I'm in a fierce struggle to stay awake!"