I know exactly what you mean! I use logic far better when I'm dreaming lol.

The other night I was Lucid Dreaming but things did feel slightly real when I looked out of the open window. I remember thinking "If I jump and I'm not dreaming I will die," so I checked to see if I could 'hover' in the air.

Next thing I know, it's safe to fly out the window and I'm off!

I also use light switches as signs in my dreams. I check the light switch and if it doesn't turn on I somehow just know I'm dreaming hahaha