I took Eternus for 5 days as prescribed along with my regular use of Quality Focus. I did not have great sleep for some of that time because of personal family commitments. ( Stress that I do not believe lack of a full night's sleep was caused by the products.) Still, I found that when I did get down to work, my focus was better than normal, This, even without my usually sleep, I was more focused with Eternus and Focus in combination. I suspect that with proper sleep the positive impact would...Read more.