Why are guys attractive when they are tired?

What is so attractive about a guy who is tired. I have a colleague who I'm not attracted to at all. We don't talk much, just small talk that doesn't last longer then 5 minutes. I saw him the other day and he ordered some breakfast (I work in a restaurant), we talked for a bit but you can tell he was super tired, he had dark circles under his eyes, his voice sounded sleepy and he seemed a lot more calm and vulnerable then his usual self. I was instantly tuned on by him soo much! And I am not attracted to this guy whatsoever. What is it about guys who are tired that makes them so hot? I have noticed this a lot, tired guys just become ten times more attractive then when they are not.
Why are guys attractive when they are tired?
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