When Is It "Officially" Morning?

"I don't care if it's 5 A.M. I don't consider it "tomorrow" until I wake up..." I laughed out loud when I read this, because this reminded me of a conversation I had just the other day. My friend called me very early in the morning and asked immediately upon my answering, "Is it too early for me to call?" The first thing that came to mind was, "Anytime that I am still asleep, is too early for anyone to call"... but, if course I responded with, "It's never too early to call, if you need me"... ; )