Evening Screen Light Can Suppress Melatonin
Key takeaway
Yes — evening screen light, especially blue-enriched emissions near ~480 nm, can suppress melatonin; tablet studies have reported roughly a 22% drop after about two hours.
- Evening screens can lower melatonin versus dim light in controlled exposures.
- Tablet studies reported about a 22% melatonin reduction after ~2 hours.
| Metric | Scientific Observation | Impact Magnitude | ||
|---|---|---|---|---|
| Melatonin after ~2 h tablet light | Wood/Figueiro tablet studies | ~22% reduction (study conditions) | ||
| Spectral sensitivity | Circadian system peaks near ~480 nm | Blue-enriched light more suppressing | ||
| Source | Wood et al., Appl Ergon | doi:10.1016/j.apergo.2012.07.008 |