A mismatch between when our internal clock wants us to wake up and when the alarm clock rings to get people to work and school on time could be fuelling obesity, a European study suggests.
Tight work schedules and a hectic social calendar structure modern societies. The result is "social jetlag" — a syndrome related to the mismatch between the body's internal clock and the realities of our daily schedules that makes people sleepy.
Social jetlag means most people feel like they are working the early shift. (Frank Gunn/Canadian Press)
In Thursday's online issue of the journal Current Biology, researchers in Germany analyzed sleep, height, weight, age and sex data submitted by 65,000 Europeans.
"Beyond sleep duration, social jetlag is associated with increased body mass index," a measure of overweight and obesity, Professor Till Roenneberg of Ludwig-Maximilians-Universität München in Munich and his co-authors concluded.
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