Why do guys like when a girl [girlfriend or "romantic interest"] gets sleepy?

lePoivre
I've noticed with the guys I've dated that when I get tired and start yawning, they seem to get a little excited. Not sexually (or at least not that I've noticed...) but just like, I'll yawn and they'll smile and become more cuddly. Why is that? Do guys just like it when a girl falls asleep in their arms, even if they don't have sex with her? And if so, why?
Why do guys like when a girl [girlfriend or "romantic interest"] gets sleepy?
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