Blue light is a type of visible light that has a short wavelength, which means it carries more energy than other colors of light. It is emitted by natural sources like the sun and artificial sources such as LED lights, computer screens, and smartphones. Blue light plays a role in regulating our sleep-wake cycle, also known as the circadian rhythm. Excessive exposure to blue light, especially during the evening, can disrupt sleep patterns and cause eye strain. Some people use blue light filters on their devices to reduce exposure, while others may wear blue light blocking glasses to help minimize potential effects on their eyes and sleep quality.