I Miss My Grandmother Who Passed Away

I am pretty sure I heard her calling me last night. She just uttered a word, the word she used to call me when I was a kid.

I woke up startled,with the images of a dream in front of my eyes. But she was not in that dream. Where did that voice come from? I felt more comforted than scared, actually, and stood awake for a while waiting for her. But nothing happened.