The harms of sleeping with the lights on include reduced sleep quality, lowered immunity, damage to vision, and weight gain.
The rhythm of the human body is closely related to light. From 2 to 3 a.m. is the peak period for melatonin secretion in the body. Sleeping with the lights on will inhibit the secretion of melatonin. Being in this state for a long time will lead to premature aging, poor resistance, and an increased risk of cancer.
Sleeping with the lights on can create light pressure, and doing so long-term will make people, especially infants and young children, agitated and emotionally unstable, resulting in difficulty falling asleep and poor sleep quality.
After entering a state of sleep, melatonin is secreted. Its secretion can inhibit the excitability of the sympathetic nervous system, lower blood pressure, slow heart rate, allow the heart to rest, enhance the body's immunity, and eliminate fatigue. However, sleeping with the lights on will inhibit the secretion of melatonin in the human body, leading to a long-term reduction in immunity.
Sleeping with the lights on prevents the pupils from truly relaxing and resting. The continuous stimulation of light on the eyes keeps the eye muscles and nerves in a tense state, easily leading to myopia, retinal damage, and even an increased risk of cataracts.
There are two types of fat in the human body: brown fat and white fat. White fat stores excess calories, while brown fat generates heat by breaking down white fat. Sleeping with the lights on at night not only disrupts the human biological clock but also interferes with brown fat, leading to fat accumulation and obesity.
