Ive noticed a common thing that is in nearly every non lucid dream that I have and is almost never in my lucid dreams.
My hometown. Well actually either of two towns that I live on the edge of. Even if things are completely impossible in waking life and I NOTICE that they are impossible I wont become lucid if I am in either of the two towns that I call home. I live in one town and go to school in the other.

I will give two examples. One from each town actually.

in one dream I was at school and there was a door that I knew in the dream was impossible because of the way it worked. Not only was the door impossible but there was a whale attacking people on land (I dont even live near the coast). Even knowing that one thing was IMPOSSIBLE and another thing highly improbable I didnt even consider that it could have been a dream because i was at school in my own town.

In another dream I was at my house and I started walking to a friends house. Along the way I started to glide through the air. I was doing things that I knew can only be done in dreams yet I didnt think for a second that it could have been a dream because I knew exactly where I was.

It seems that if my dreams take place in a familiar location even if the situations in them are completely extreme I will not become lucid. However, if I am dreaming and I am not close to home I will often become lucid.

Examples of that include a post apocolyptic city, a town that I had no idea where it was, Canada (which I have never been to), and a desert. In all of those locations I was lucid very shortly into the dream with almost no thought to whether or not im dreaming. I just KNOW when im somewhere I dont know in real life.

I have had lucid dreams that started out obeying every natural law and showing no signs of dreaming besides being somewhere else and Ive become lucid yet at the same time I have had completely fantastical dreams that take place close to home without any lucidity.