Here's why:
* Hyperbole is an exaggeration used for emphasis or humor. It's not meant to be taken literally.
* Half-asleep is a common idiom that describes a state of being partially awake and partially asleep. It's not an exaggeration; it describes a real experience.
Example:
* Hyperbole: "I'm so tired, I could sleep for a week!" (This is an exaggeration; no one can sleep for a week straight.)
* Half-asleep: "I was half-asleep when the alarm went off, so I hit snooze." (This describes a real experience where someone is partially awake but not fully conscious.)
Therefore, "half-asleep" is not a hyperbole, but rather a descriptive phrase.