I do, but it's not an official one. Doesn't need to be as I'm dirt poor
but I felt it would be important for my loved ones to know I had thought about them all, remembered them and left them all some of my possessions that I know they'd like to have. The other reason I wrote some stuff up is because music is incredibly important to me and I wanted to put black on white my wishes with regard to the music played at the funeral.
I don't think it morbid at all to consider these things, all it does is make sure there will be as little trouble as possible for your relatives in case you might die.