What does a sleep expert think about blue-light-blocking glasses? Expert Dr. Michael Breus wears them and shares that you want to block the blue light waves because when they hits your eye it turns off the melatonin faucet in your brain. Melatonin is the key that starts the engine for sleep. You are likely getting blue light exposure before bed from your TVs, cellphones, laptops and other devices. Dr. Breus says the two things you should look for in blue light blocking glasses: will the glasses block the right frequency and will they block brightness. He shares the most effective blue-light-blocking glasses will have an amber color.