Light therapy
Morning sunlight and circadian rhythm, red-light research, SAD lamps.
If you only read one
Morning sunlight and the circadian system: the simplest light protocol
Morning bright light is the single most-replicated intervention for circadian rhythm. A short look at what the research actually shows, dose, and timing.
Grade A · 2 min read · Last reviewed 2026-05-17
Light therapy for jet lag: the cheapest free intervention
Evidence BTimed light exposure at the destination is the most effective free intervention for jet lag. The phase-response curve, eastward vs westward strategies, and a practical day-by-day protocol.
3 min read · Last reviewed 2026-05-19
Light glasses (Luminette, AYO): what the trials use and what they measure
Evidence CWearable light therapy glasses promise circadian benefits in a portable form. Smaller evidence base than 10,000-lux SAD lamps, and the practical effectiveness depends on usage. What the published research shows.
3 min read · Last reviewed 2026-05-19
Morning sunlight and the circadian system: the simplest light protocol
Evidence AMorning bright light is the single most-replicated intervention for circadian rhythm. A short look at what the research actually shows, dose, and timing.
2 min read · Last reviewed 2026-05-17
Red light therapy: what the human research actually supports
Evidence CRed and near-infrared light devices are sold for everything from skin to thyroid to muscle recovery. Which of those claims have human evidence, which don't, and what to think about devices.
2 min read · Last reviewed 2026-05-17
SAD lamps: what's a real light box and how to use one
Evidence B10,000 lux light boxes are a common non-drug option for seasonal affective disorder, though NICE says the evidence for their efficacy is uncertain. Specifications, timing, and what the trial evidence supports.
3 min read · Last reviewed 2026-05-17
Vitamin D from sunlight: the UK latitude problem
Evidence AUV-B exposure makes vitamin D in skin. At UK latitudes, this is impossible for half the year. What the synthesis biology actually requires, how skin tone changes the equation, and the safe sun-exposure conversation.
3 min read · Last reviewed 2026-05-19
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