Do you sleep with artificial light in your bedroom, like 75% of the world's population? Research shows this habit can impair your immune system, muscle strength, and bone density. A study by experts at Leiden University Medical Center in the Netherlands, published in Current Biology, uncovered these effects in mice.
Researchers exposed mice to constant light for 24 weeks, eliminating natural day/night cues. This disrupted their biological clocks, leading to muscle weakness, reduced bone density, and immune system changes. Further studies are needed to fully understand the immune impacts.
The encouraging news? These effects are completely reversible. Just two weeks of sleeping in total darkness restored the mice's health by reinstating a normal light/dark cycle.
This builds on prior research linking nighttime artificial light to sleep issues, fertility problems, and weight gain—especially in older or vulnerable individuals. Start tonight: power down devices and embrace darkness for better rest.
