Light is made up of electromagnetic particles that travel in waves. Every wavelength is represented by a different colour and together these wavelengths make up the electromagnetic spectrum.
Blue light has one of the shortest, highest-energy wavelengths in the visible light spectrum.
As a result, too much exposure to blue light can tire your eyes as you end up straining and blinking a lot less than you should, which is why you may also have experienced your eyes feeling dry.
Whilst research is still being done on this, blue light may be one of the main reasons for eyestrain, headaches, physical and mental fatigue caused by many hours sitting in front of a computer screen or other electronic device.
Exposure to blue light late at night (through smart phones, tablets, and computers) can disturb the wake and sleep cycle, leading to problems sleeping and daytime tiredness as well.