Whether you think you can, or think you can't, you're right - Henry Ford. One of my favorite quotes. Because I have found it to bed true and therefore obey the implied advice to control my thoughts so I can succeed.
In lucid dreams, people are aware of the fact that they are dreaming, and can control their dream plot. Now scientists have found they can induce this weird state of mind in people by zapping their brains with a specific frequency of electricity.