Also known as: blue blockers, evening light management
Latest evidence update: 2021-08-08
Strongest in Consistency (95). Held back by Sample size (10).
Solid mix of RCTs with some methodological gaps.
Few independent replications; results not yet robust.
Small combined sample; treat as preliminary.
Studies agree on direction of effect.
Mostly pre-2020 research; updates may be needed.
No per-outcome numbers yet for this one. Each finding's direction and strength is shown in the research below.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Wearing blue-blocking glasses or dimming screens 2 hours before bed to prevent melatonin suppression.
Amber-tinted blue light-blocking lenses worn for 2 hours before bedtime for 7 consecutive nights improved Pittsburgh Insomnia Rating Scale (PIRS) total scores compared to clear placebo lenses in individuals with insomnia.
Blue light blocking glasses reduced subjective sleep onset latency compared to control glasses in healthy adults.
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