Bedroom-invading smartphones jumble body's sleep rhythms

Using a smartphone, tablet or laptop at bedtime may be staving off sleep, according to HMS scientists, who have found specific wavelengths of light can suppress the slumber-inducing hormone melatonin in the brain. Charles A. Czeisler, the Frank Baldino, Jr., Ph.D. Professor of Sleep Medicine at HMS and Brigham and Women’s Hospital, is quoted.

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