Thumbs up Couple questions.

So I got my virgin mobile HTC desire 816 and I totally love it, but I got a couple questions about it. I noticed that when I had it sitting on my nightstand, and I got a message I picked it up and the screen woke. It seems to only work when the phone is horizontal. The weird thing is I cannot find any setting for it. Has anybody else noticed this feature? Also, I know on virgin mobile website it claims the 816 has gorilla glass 2. Is that true? Thanks guys.