Article: Melatonin magic: it's touted as a remedy for seasonal blues, jet lag, sleep disorders, even cancer. But experts say "proceed with caution.".

Seasons are changing, which means your mood may be changing as well. Dropping temperatures, shorter days and longer nights are enough to give anyone a case of the blahs. But it might be something more, such as Seasonal Affective Disorder (SAD), a cyclic form of depression.

Or perhaps you're experiencing sleep difficulties that rise and fall in severity with your body's natural adjustments to changes in the length of days, sunlight, darkness and temperature--what is known as the circadian rhythm, or your "biological clock."

When that clock goes awry, it can cause all kinds of problems. That's why more people are looking to melatonin for relief. Melatonin ...

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