It's because when I smile I look like I'm twelve.
So I scowl. Because scowling totally says: Hey I'm 19. See the scowl!?
And I actually pretty much do look like that in the morning. I was just groping for something to say. However, if I don't dry my hair and go to bed with it wet I look like I Have a brillo pad on my head.
Oh and I'm awake in the picture, so the groggy grump face is Missing in Action