alot of times if i have one dream of me dying, for the next few dreams i have i am dying as well. usually for me its when I'm depressed or feeling particulary blue.
maybe you are sad? i also notice that i dont act sad around ppl because i feel the ened to entertain them or somthing, but when no one is around to impress, do you notice yourself kinda depressed?

i hope that help a little maybe