I've never had one where I 'died' but I've had a few sad dreams. One of my saddest was there was this guy, who I could've SWORN I knew, but anyway, he died and now he was this ghost in this mirror and I had to do this mission (I think it was something about retrieving stolen shoes. WHY?!?!) then he could live again. But I had to finish the mission before a certain amount of time or he'll be a ghost forever, gone from the mirror, roaming the earth...alone. So when I finished it, I ran to the mirror where the man who told me about the mission was and I had a huge smile on my face. I ran up to the mirror and he was gone.
"You said I could save him!" I yelled to the man, still staring at the mirror.
"If you did it in a certain amount of time. He's gone now. But you did do a good deed." He answered, calmly.
My eyes started to tear up and I woke up with a start. Even though I knew it was a dream as soon as I woke up, the ghost seemed so real, and I thought I knew him.....so I cried anyway.