Bangel

I have noticed that when Buffy cries she opens her eyes too much.
Let me give you some examples;

1) In "fool for love"

2) In "chosen"

3) In "the body"

4) In "helpless"

5) In "becoming part 2"

6) In "i only have eyes for you"

7) In "seeing red"

and many others

I don't know if I am right. Maybe it is something that Sarah Michelle Gellar does or Joss Whedon's instructions or something that happens spotaneously.
It seems strange to me. I don't think I like it. I find it a bit silly.

Is it on my mind or you noticed that too?