What effect does blue light have on sleep?

Blue light has a significant impact on the body’s circadian rhythm, particularly in its ability to suppress melatonin production. Melatonin is a hormone that helps regulate sleep-wake cycles, and its production is primarily stimulated by darkness. Exposure to blue light, especially in the evening, can signal to the brain that it is still daytime, thereby inhibiting the release of melatonin. As a result, this suppression can lead to difficulties in falling asleep and impacting overall sleep quality.

This understanding is crucial for managing sleep hygiene, especially in the context of modern lifestyles where screens emitting blue light are prevalent. For individuals seeking to improve their sleep, it is often recommended to limit exposure to these light sources in the hours leading up to bedtime, thereby allowing melatonin levels to rise naturally and facilitate better sleep.