What's up with all this gleeking?

I cannot make myself gleek. I knew a girl when I was young who could do it, but I never managed it. Not that I really tried. It didn’t seem like a marketable talent to me. Throughout my life I would commit the occasional gleek and I’d say; “Well, that was odd.”
But recently, say in the past month or so, almost every time I yawn, I gleek.
Why?