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You may have fond memories of your mother or grandmother making you a glass of warm milk to help you fall asleep.

This may not be just an old wives’ tale. Milk contains the amino acid tryptophan, a precursor to the brain chemical serotonin.

Although the topic is a controversial one, some people believe that tryptophan and serotonin might make it easier to sleep. Or maybe a simple glass of milk brings back soothing childhood memories, which help you drift off.

(Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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