Study suggests most Americans would be healthier without daylight saving time
The researchers used a mathematical model to translate light exposure under each time policy, based on local sunrise and sunset times, to circadian burden — essentially, how much a person’s innate clock has to shift to keep up with the 24-hour day.
They found that over a year, most people would experience the least circadian burden under permanent standard time, which prioritizes morning light. The benefits vary somewhat by a person’s location within a time zone and their chronotype — whether they prefer early mornings, late nights or something in between.