You might have been feeling abit emotional towards your grandma some time before that dream happend unconsciously then those feelings showed up amplified in your dream. I find it that sometimes when intense love (not sex) or pain is involved in a dream it often repeats once or twice. Try getting over the fact that people dont live forever and learn to just "fly" out of the quick sand. I'm thinking the reason why your getting "stuck" is because your holding onto something emotional so.. let go of it and you should pop out of the quick sand!