Tablet Insomnia

Just two hours’ exposure to a device with a self-luminous backlit display—a Kindle, iPad or other tablet computer—can cause a suppression in melatonin, which in turn could lead to trouble falling asleep, according to a study from the Lighting Research Center at Rensselaer Polytechnic Institute. Melatonin, a hormone secreted by the pineal gland in the brain, helps regulate sleep cycles.