Thirty days is the point where device specifications stop being marketing material and start being protocol limits. A fortnight forgives
Lux was built for vision. Circadian research needs a different weighting, and the gap between the two is where a
Two instruments measuring the same night produce different numbers, and the difference is often larger than researchers expect. Sleep onset
Light-exposure research increasingly depends on measurements collected in real-world settings. Photopic illuminance describes light according to human visual sensitivity, while
Paper diaries get completed in the waiting room. Everyone in sleep research knows it, and the practice persists because the
Healthcare researchers increasingly seek objective methods to understand how behavior changes across days, weeks, and months. Traditional assessments provide snapshots
