Everyone has fears and the vast majority of them are realistic (people fearing not doing well in school, life, work, marriage etc), however a lot of people also have a lot of fears that are (disproportionally) unrealistic, such as some peoples fears of sharks or flying.
I am not talking about actual medically-confirmed/pathological fears, but more the run of the mill ''I know its really strange that im scared here but I am anways'' kind of situations.
For me personally, the thing that comes to mind first is when I go to bed: I always have to walk through a completely dark room for 2-3 secs before I reach my lightswitch, which is right in front of the lightbulb myself, so whenever I switch it on when I go to bed I am very temporarily blinded while my eyes adjust to the sudden light. My fear is then that when my vision comes back I see someone standing behind me. Obviously this can happen but the chances are really low (I live in a super peaceful neighbourhood & there is noone that wants to murder me for any reason afaik).
So, what is your greatest unrealistic fear?