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The Washington Post, Published January 07 2013

Tuesday Tip: Using light to help reset your body clock

Light provides your body’s most important cue for synchronizing circadian rhythms. Light exposure in the morning helps your body clock spring forward (just as clocks do at daylight saving time), and light at night prods your body clock to fall backward. Here’s how to use light to sync your body clock to the local time.

When traveling east:

If these calculations seem too complicated, researchers at the Mayo Clinic have created a chart that can help: www.ccjm.org/content/78/10/675.full.pdf.

A smartphone app such as JetLag Genie can help you figure out your optimal light schedule.