This is an issue i suffer from myself, having been jumpscared many times and at the worst times of day possible, i'm fearful when it comes to jumpscares. I have thought of possible solutions, but i'm not sure yet. One thing i noticed though, is that the more you come accross the object of fear, the more you get used to it and part of the fear starts to vanish.

My fear of SP is a good example. I was extremely afraid of even entering the state, until i accidentally entered it a lot, so i eventually got used to entering it accidentally. The second fear was the weird hallucinations as such as sound or vision. But after a recent entry into SP, my fear from even the scariest of sounds has dropped dramatically. Naturally enough, i keep my eyes closed during SP to this day.