Blue light is a wavelength of light emitted by screens, including electronic devices, fluorescent lights, and LED lights. It is capable of influencing sleep cycles, alertness, and hormone production and is a significant portion of the visible light spectrum. Blue light can trick the brain into thinking it is daytime, which inhibits the production of melatonin, a natural hormone essential for preparing the body for rest. This delay in melatonin production can disrupt an individual's circadian rhythm, the 24-hour cycle that signals the body to carry out essential functions, including achieving an appropriate amount of sleep. Exposure to blue light after sunset can suppress the body's release of melatonin, leading to difficulties falling asleep and promoting feelings of alertness rather than tiredness.