2. Contd..
Use of a light-emitting electronic device
such as e-books in the hours before
bedtime can adversely impact sleep,
overall health, alertness and the circadian
clock, a new study has found.
Researchers at Brigham and Women's
Hospital (BWH) compared the biological
effects of reading a light-emitting
electronic device (LEeBook) compared to a
printed book.
3. Contd..
“We found the body's natural circadian
rhythms were interrupted by the short-
wavelength enriched light, otherwise known
as blue light, from these electronic devices,“
said Anne-Marie Chang, corresponding
author, and associate neuroscientist in BWH's
Division of Sleep and Circadian Disorders.
“Participants reading an LE-eBook took longer
to fall asleep and had reduced evening
sleepiness, reduced melatonin secretion, later
timing of their circadian clock and reduced
next-morning alertness than when reading a
printed book,“ Chang said.
4. Contd..
Previous research has shown that blue light
suppresses melatonin, impacts the circadian clock
and increases alertness, but little was known about
the effects of this popular technology on sleep. The
iPad readers had reduced secretion of melatonin.
The use of light emitting devices immediately before
bedtime is a concern because of the extremely
powerful effect that light has on the body's natural
sleepwake pattern, and may thereby play a role in
perpetuating sleep deficiency . Although iPads were
used in this study, researchers also measured
laptops, cell phones, LED monitors, and other
eReaders, all emitting blue light.
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