One of the best night’s sleep in recent memory was when I was engrossed in a print edition of the Harry Potter series. I recall falling blissfully asleep to dimly lit paper pages of adventurous wizards and waking up with a surge of sustained focus. At the time, I attributed my refreshing sleep to the joyous relaxation of a good book before bed.
But, then I discovered that exposure to nighttime artificial light — including, possibly, the iPhone I would normally read on — has been wreaking havoc on humanity's natural sleep cycle. Most recently, researchers at Harvard Medical School found that volunteers who dozed off to e-readers experienced less REM sleep, a vital portion of deep sleep associated with improved cognitive functioning.
The...
How I keep screens from causing me insomnia
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