i sure hope not. I had a nightmare last night that vultamore from Harry Potter series was trying to kill me, I hope he wasn't thinking of me, and considering he's just a character, that would make the answer no. Sorry :) You're probably dreaming of him or her because before you went to bed you were thinking about them.
Haha I hope not. Dafey has a good point. If we dream about someone it doesn't mean they were thinking about us because think about it we've all had nightmares before...I don't think Freddy Krugar was thinking about killing me before he went to bed. :D