Circadian Biomarkers Before and After the Transition to Spring Daylight Saving Time
Mark S. Rea, John D. Bullough, Mariana G. Figueiro · 2026
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Description
Mark S. Rea and colleagues measured body-clock and sleep markers in healthy volunteers immediately before and after the spring shift to daylight saving time. Volunteers wore light sensors and wrist activity monitors, and melatonin onset was measured directly. Predicted lowest core body temperature was calculated from the light data, and sleepiness was rated four times daily.
The spring shift moved weekly time in bed by at most 21 minutes and sleepiness scores by less than half a point, neither change reaching statistical significance. The timing of temperature and melatonin markers drifted slightly apart after the shift. For this group, the authors conclude, the spring clock change had little if any effect on sleep or circadian rhythm.
Catalog record
| CREATOR | Mark S. Rea, John D. Bullough, Mariana G. Figueiro |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 31 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |