Also known as: morning light, sunlight viewing, AM light
Latest evidence update: 2026-12-28
Strongest in Consistency (92). Held back by Recency (64).
Solid mix of RCTs with some methodological gaps.
Confirmed across many independent studies with significant findings.
Tens of thousands of participants pooled across studies.
Studies agree on direction of effect.
Healthy mix of recent and established research.
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.
View bright natural light within 30-60 minutes of waking to set your circadian rhythm and optimize cortisol/melatonin timing.
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Light therapy significantly improved sleep efficiency in shift workers compared to control group.
JAK inhibitor (baricitinib or tofacitinib) combined with NB-UVB phototherapy significantly reduces total VASI score compared to NB-UVB alone in non-segmental vitiligo.
Light therapy reduces Insomnia Severity Index (ISI) scores by 2.16 points in patients with insomnia.
Low-level light therapy significantly reduced the recurrence rate of oral lichen planus lesions.
Light therapy reduces depression symptoms in adolescents and young adults by stimulating circadian rhythms with pooled standardized mean difference of -1.59.