I agree with one poster about lucid dreaming.
Caution first, because you do not want to travel to a landscape without the skills to acknowledge where you are.
There is a book written by The Dali Lama called Sleep, Dreaming, and Dying
Another good book, which has nothing to do with sleep but mindfulness. This book is called, Coming to our senses by Jon Karat-Zinn. I would read the second first.
Everything in your dream is a reflection of you and your emotions.
I am aware when I am dreaming because of years of training.
Death dreams are not about a person dying. Rather they are singals that you want out of the way you are feeling.
Best Wishes,
H.