Regardless of the reason whether it's due to them about to hit it big around the world or not...it illustrates something that comes up a few times in Men At Work's music. Paranoia. It's not necessarily to the level of Paranoid schizophrenia but the restlessness is about the insomnia caused by him overthinking everything (I think about the implication of diving in too deep). He's paranoid that something will go wrong. You'll see the same thing in Who Can It Be Now", "It's a Mistake" (this one may take a bit more looking at the root cause of why he would write a song about that and at least parts of "Down Under".
Regardless of the reason whether it's due to them about to hit it big around the world or not...it illustrates something that comes up a few times in Men At Work's music. Paranoia. It's not necessarily to the level of Paranoid schizophrenia but the restlessness is about the insomnia caused by him overthinking everything (I think about the implication of diving in too deep). He's paranoid that something will go wrong. You'll see the same thing in Who Can It Be Now", "It's a Mistake" (this one may take a bit more looking at the root cause of why he would write a song about that and at least parts of "Down Under".