The Effect Of Light On Sleep, Circadian Timing, And Next Morning Alertness

1197 Words Nov 23rd, 2015 null Page
Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness
In an article titled “Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness” published in January 27, 2015, authors Anne-Marie Chang, Daniel Aeshbach, Jeanne F. Duffy, and Charles A. Czeisler write that the use of light-emitting electronic devices before bedtime prolongs the time it takes to fall asleep, delays the circadian clock and suppresses levels of melatonin which is a sleep promoting hormone in addition to reducing the amount of REM sleep and also the alertness the morning after.
According to the article, “In the past 50 years, there has been a decline in average sleep duration and quality, with adverse consequences on general health.” A survey suggests that out of 1508 Americans, 90% of them use some type of electronic device a couple nights a week before bed. The hypothesis suggest that there are negative impacts on sleep and human health due to the use of electronic devices that emit short wavelength light that affects our biology hours before bed. “The use of light-emitting devices immediately before bedtime is a concern because light is the most potent environmental signal that impacts the human circadian clock and may therefore play a role in perpetuating sleep deficiency. ”The artificial light exposure has been shown evidently to produce alerting effects while suppressing melatonin and…

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