Researchers at the University of Michigan have developed an iPhone app, called Entrain, that they say can help combat Jet Lag and adjusting to new schedules. The app calculates a new biological rythym, formally known as a circadian rythym from information you enter about your current cycle and the time zone or new cycle you're going in to.

The researchers point out that light is the most important factor in our circadian cycles so the app uses a mathematical formula to calculate the best times for you to be in and out of light to enable you to get over the jet lag in the fastest possible time.

Entrain is available now, for free, on the iOS App Store.

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