Key Takeaway
Wearing amber-tinted blue-blocking glasses for 2 hours before bed improved sleep quality, duration, and insomnia symptoms in adults with insomnia, compared to clear placebo lenses.
Summary
Randomized controlled trial testing whether blue-blocking glasses worn before bed could improve sleep in adults with insomnia symptoms.
Methods
- Randomized, placebo-controlled trial
- 14 adults with insomnia symptoms
- 2-week intervention
- Amber lenses (blue-blocking) vs clear lenses (placebo)
- Worn for 2 hours before bedtime
- Sleep measured by actigraphy and questionnaires
Key Results
- Significantly improved sleep quality (Pittsburgh Sleep Quality Index)
- Increased total sleep time by ~30 minutes
- Improved insomnia severity scores
- No difference in sleep onset latency
- Effects emerged within first week
Limitations
- Small sample size
- Short duration
- Participants could identify lens color
- Insomnia symptoms, not diagnosed disorder