I probably fear how it happens rather than the reality of it. I won't exist in my body anymore. I won't wake up again. That scares me the most. Anticipating death is not healthy. Worrying about it and stressing about how or why will only make the fears worse. If I can go peacefully with a level of awareness at the end, then that's the best I can hope for. I had a family member pass in their sleep last year and its tough because they just left, and didn't get to say goodbye. I still can't believe it. His family didn't get to say goodbye. So, it makes you question, does the soul feel that sense of loss or discomfort with leaving things unsettled? I also believe that having faith in God makes a difference. If someone feels secure in Him, then they may feel they won't need to fear the afterlife. I think it's the uncertain feeling that you don't know or not sure where your soul will go or be, that really scares most people.