Prescription sleep aids may not always be the best method of alleviating insomnia. In some people, behavioral modification -- like changes in diet, exercise and sleep environment -- may do the trick and could be less risky.

Here's how to know if you may be a candidate for a prescription sleep aid, courtesy of the National Sleep Foundation:

Insomnia is causing problems during everyday activities, such as work or driving.
Lifestyle and behavior changes have not worked.
You have insomnia-related distress.
Insomnia is predictable due to a temporary health or biological condition, such as premenstrual syndrome or jet lag.

source: http://health.yahoo.com/

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