I'm gonna go out on a limb here and suggest that she may have been sleeping with her hand pressed up against the button on her shirt...
Either that, or she's just developing some freakish disease. Hmmm... will we ever discover the truth???
I was considering just posting the first two pictures for you, but then I figured that would be kinda boring, and wouldn't everyone just love to see yet another picture of Lena? It just wouldn't be right to deprive you. So here she is playing with my lens cap. Pretty much the only way I can get her to sit still for a photo is to let her play with something that's normally forbidden.
And as you can see, she is definitely making the most of it.