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Your E-Reader May Be Hurting Your Sleep

Reading before your bedtime is a great way to wind down, but it may be better to opt for the old-fashioned route of snuggling up with a novel instead.

Published research in the Proceedings of the National Academy of Sciences suggests that using a light-emitting electronic device in the hours before bedtime not only makes it harder to fall asleep, but it affects how sleepy you are the next day and your overall health.

Your E-Reader May Be Hurting Your Sleep


Researchers from Brigham and Women’s Hospital in Boston, Massachusetts, analyzed 12 study participants for 2 weeks. Participants read on an iPad for 4 hours before their bedtime for 5 straight nights then, repeated the process with printed books. For some of the participants, the order was reversed, starting with printed books then moving on to iPads.

The iPad readers were less sleepy in the evenings, took longer to fall asleep at night and spent less time in the REM sleep phase. Additionally, they had lower levels of the sleep hormone melatonin, their circadian rhythms were pushed back by one hour and they found themselves less alert in the mornings, even after 8 hours of shut-eye.

According to Dr. Charles Czeisler, chief of the BWH Division of Sleep and Circadian Disorders, overall we’ve been sleeping less with a decline in quality over the past 50 years. “Since more people are choosing electronic devices for reading, communication and entertainment, particularly children and adolescents who already experience significant sleep loss, epidemiological research evaluating the long-term consequences of these devices on health and safety is urgently needed.”

iPads were used in the study, but it’s important to note that the researchers measured all other blue light-emitting devices, including smartphones, laptops, other e-readers, and LED monitors. The activities you perform before bed have a huge impact on your snooze.

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2 Responses to Your E-Reader May Be Hurting Your Sleep

  1. Fabian Tjong November 13, 2016 at 8:30 am #

    Another great reason why I always use red screen filters for all my devices. I started to use apps like twilight because I felt that the blue light was too bright for my eyes at night.

    But seeing that it also has an impact on your sleep quality makes it even more important.

    Just a word of advice to maybe change the title of this article. For me E Readers are electronic book readers with special e ink screen. The E ink screen is made to mimic ink on paper and therefore it does not makes your eyes dry while reading.

    The E reader you mention here are Ipads, which indeed are not great to use at night.

    Anyway I enjoyed your articles keep up the good work 🙂

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