This is a sort of Autosuggestion, which you can plan on before starting the practice.
You can eliminate your bad or unwanted habits and sow the seeds of good attitude.
You can change your behavioral pattern as per your plan.
This resolution can direct your whole life if you design it wisely and you can become more balanced, happy and content. This resolution is inserted in the subconscious mind when it is receptive & sensitive during the practice of Yoga Nidra.
This deep-rooted seed, eventually manifests again and again at a conscious level and brings about changes in your personality.