Oh yes, I have. It is called Black Screen for Windows. With it, you can make your screen black by pressing a key combination. I set it up to make my screen bl

Oh yes, I have. It is called Black Screen for Windows. With it, you can make your screen black by pressing a key combination. I set it up to make my screen black for 5 – 7 minutes after every 30 minutes of work. It forces me to take periodic breaks, not to sit at the computer for too long. It is a cool tool to refresh attention too. Feel free to check it at https://blackscreen1.com/ https://blackscreen1.com/