Is it normal when up really high and very open area i think this? (details)

i have dreams sometimes that i fall in to the sky, or see other people fall in to the sky. my active imagination to the point i can actually see it through thought. when i'm up really high and its a very open area around me that has a great view of whats below i see myself falling in to the sky. like gravity will just shut off and suck me up to the sky. i know it can't happen, but yet, there it is.

i play this game called dragon age, sadly i know the feeling the dwarves have when finally coming up to the surface. they fear they are going to get sucked up in all of that sky.

i don't like this fear, its silly, and can't even happen. i'd feel better if i had a fear that actually made sense and could actually happen.

i guess i'm some nobody who's too lucky to have realistic fears. wonderful...