Special Blue Wavelength Light-Blocking Glasses May Help Promote Sleep Readiness.

reports that according to a study published online Oct. 3 in the Journal of Adolescent Health, special eyeglasses that block blue wavelength light from digital devices, TV and computer screens may help promote sleep readiness by bedtime. Blue wavelength light has been found to alter circadian rhythms, delaying sleep onset by preventing a rise in the hormone melatonin. In the study, 13 adolescent boys wore the glasses in the evening for a week while using digital devices, then underwent saliva tests for melatonin levels. The following week, they wore clear eyeglasses instead and repeated the melatonin tests. When the boys wore the special glasses, melatonin levels were higher and they felt sleepier at bedtime. http://www.reuters.com/article/2014/10/23/us-health-sleep-blue-light-idUSKCN0IC21W20141023