Blue light directly suppresses melatonin production, which prevents falling asleep, and glasses that block this light help maintain this production.

noli's read

It is scientifically established that light, particularly in the blue spectrum (short wavelengths), stimulates retinal ganglion cells that send a signal to the brain to inhibit melatonin secretion (meta-analysis, Journal of Pineal Research). This mechanism is real and plays a key role in regulating our internal clock. However, the impact of so-called 'blue light' glasses is more nuanced: while some studies (RCT, Chronobiology International) show an improvement in sleep quality with these filters, the effect is often modest and depends heavily on the intensity of the ambient light. It is an exaggeration to present these accessories as a miracle solution, because melatonin is just as sensitive to overall light intensity (brightness) as it is to color alone. Finally, research often indicates that limiting screen exposure before bedtime is more effective than simply filtering blue light. The advice is therefore technically grounded in the biological mechanism, but the proposed solution is sometimes overstated in relation to behavioral habits.

the sources

1. 1Singh S et al. 2023