Man and Night

We need light to live. But we find ourselves in a state of constant light that seems displaced: During the day, we stay indoors and expose ourselves to too little daylight, which is necessary, among other things, for the production of vitamin D, which is so important for our health. At night, we expose ourselves to too much artificial light. A clear rhythm between light and dark, which is so urgently needed, is no longer recognizable.
Why do we need the natural night? Humans need sleep. Artificial light disrupts our nighttime rest. Bluish light (from smartphones, screens, TVs) in particular inhibits melatonin production. Even small amounts are sufficient. It can take one to two hours for melatonin production to resume. Bright, bluish light before bedtime or during sleep interruptions also impairs the quality of sleep.
This in turn leads to sleep disorders and even a disruption of the melatonin balance.
However, melatonin controls many bodily functions, including repair and regeneration processes and the wake/sleep cycle. It is also an effective antioxidant.
Chronic lack of sleep leads to exhaustion and illness, becoming a destructive cycle.
The dark sleeping environment is of no use if you have previously looked at the bright screen or the dazzling street lamp. The more blue the light has, the more negative the effect and a weak light source is enough to disturb sleep or the difficulty of falling asleep.