Ruminative thoughts can prevent people from getting a good night's sleep (we tend to think of things that have happened or worry about what is going to happen). Mendi can help break this cycle with neurofeedback training. While this training does not act as a direct sleep aid like a medication would, it can still be beneficial in improving sleep quality.
Remember, mindfulness practices of all forms can help when it comes to getting the restful sleep we all need.