Blue-Light Glasses Didn’t Cut Shift Fatigue
Key takeaway
No — in a studied night-shift worker sample, blue light blocking glasses did not outperform placebo glasses for sleepiness, fatigue, or actigraphy sleep measures.
- Placebo-controlled RCT in night-shift healthcare workers over about three weeks.
- Sleepiness and fatigue did not improve beyond control glasses.
| Metric | Scientific Observation | Impact Magnitude | ||
|---|---|---|---|---|
| Subjective sleepiness | No significant reduction vs placebo | Equivalent to control | ||
| Fatigue | Similar levels between groups | No improvement | ||
| Actigraphy sleep | No enhancements observed | No change vs control |