This lecture explores the impact of blue light emitted from screens on the pineal gland and melatonin production. It delves into the physiological pathways involved, the role of melatonin in regulating sleep patterns and body functions, and the consequences of chronic blue light exposure on health. The lecture also provides practical solutions to mitigate the negative effects of blue light exposure, such as avoiding screens before bedtime, using blue light filters, and considering dietary supplements.