Reality checking also causes you to become more aware and conscious overall of what's going on in the world around you. By practicing and training yourself to become very aware all of the time and suspicious of whether or not you are in a dream or reality, you will be more aware in your dreams and when strange things do happen, you'll start to very consciously question them, then either realize it's because you are dreaming and you'll be lucid, or realize you should do a reality check, which then shows you you are dreaming and will make you lucid