Here is an article LINK on current research on how the brain clean the body to toxins/waste while we sleep. The implication is that if we do not sleep well, we are not being cleared of toxins that reduce our health and well being. With NeurOPTIMAL neurofeedback, we can improve sleep capability by showing the brain its ineffective and inefficient behavior. Many folks begin to sleep better with a few sessions.
I have also included a link to the University of Rochester news story about the research.