I haven't been on TK lately, more than occasional lurking. In my lurking I came across your post yesterday about dreams. As someone who has extremely vivid/emotional dreams, I can empathize with how you were left feeling upon awakening.
Came across this article today on yahoo talking about dreams. Scroll down to the part that says "Can dreams predict the future". I found it interesting and relevant to your post. Perhaps you've been thinking about/missing your grandfather and because its been on your mind, you processed it during your dream and it manifested in that way.
http://shine.yahoo.com/channel/life/6-dream-mysteries-solved-2514671/