Thank you all for your answers! In my own experience, reciting mantras and doing reality checks troughout the day does not cause me to question the nature of my dreams. What works better for me is simply to fall asleep while maintaining the passive knowledge that i will have a lucid dream. The only way i could accurately describe it is like having an idea in the back of my mind, while at the same time carrying out my other activities like i would normally do. Then, when i am dreaming, this idea that i kept in the corners of my mind naturally comes forth and causes me to question the nature of my reality.