(But I wonder how he manages to breath like that?)
I sleep like that sometimes, though not because I'm crying or angsting, just because it's comfortable, haha.
Well,
technically I tend to roll around and sleep in a whole bunch of positions, but when you sleep like that it's like it's basically just like breathing through your nose. The way your nose sticks out of your face kind of pushes the pillow away and gives you room to breathe. Even if you push yourself really tightly against the pillow, it's not like it's a solid, so if worst comes to worst you can probably just breathe through the fabric.
That, or you scooch down so that the pillow ends around your filtrum area (that's like, the space between your upper lip and nose for those who aren't savvy with the anatomy slang, lol) so you can breathe because there's a space between your mouth and the mattress.
On a completely unrelated note, I hate sleeping on my back. YEAH!
But to stay on topic: Only two more days until 122! And I have to work tomorrow... bleeeh.
EDIT: Oh! And in regards to the omake clue, I remember people thinking it was weird that they didn't show a picture of Syaoran sleeping like the others! Guess now we know why.