Stargazing is becoming increasingly difficult. Street lighting, flickering advertising signs and building floodlights immerse cities in an ever-growing sea of light. Where electric lighting arrived in Europe's cities at the end of the 19th century, some of them now shine 4,000 times brighter than natural night light. A study published by the German Research Centre for Geosciences (GFZ) in 2018 shows that night-time lighting is also increasing in many German federal states, with Bavaria becoming three to four percent brighter every year. This has consequences for humans and animals, as the body only produces the sleep hormone melatonin in the dark. Without darkness, we live against our internal clock, sleep too little and cannot recover sufficiently.



![[Translate to en:] Adlersruhe Erzherzog Johan Huette [Translate to en:] Adlersruhe Erzherzog Johan Huette](/fileadmin/_processed_/d/3/csm_adlersruhe-erzherzog-johann-huette-c-tembler_16a1308ba3.jpg)
