I personally have the experience of Modafinil use for Excessive daytime somnolence. Amazingly, I found my stuttering disappeared. I used to not speak out in public. Now, I am confident to be able to speak my mind without stuttering. I believe modafinil will help others. Unfortunately I don’t see where it has been studied for doctors to be be able to make a recommendation on this medication. It has changed my life unexpectedly.