There are two sides of your brain. The left side, and the right side. The right side controls everything creative, your imagination, etc. The left side of your brain is in control of your logic, statistical thinking, things revolving essentially around that. 

When you turn off the left side of your brain, the right side of your brain becomes dominant (it becomes in control). So when you say affirmations you are also reprogramming your mind, the right side of your brain believes you because it is the more receptive side, therefore it will come true.

How to turn off the left side of your brain:

1. sit still for 15-20 minutes or until you feel like you feel a floating sensation. There is no correct time frame just until you feel that it is right because you will know when the left side of your brain is off.
2. say your affirmations and fall asleep and you will shift or you will manifest whatever you want to, including shifting.