During a two-week study, Brigham and Women’s Hospital researchers assigned 12 participants to read either an e-book on an iPad or a printed book before they went to sleep each evening for five nights. Then they switched formats and read for another five nights. When people read on the iPad, they
took longer to fall asleep
and spent less time in
REM sleep than with
the traditional books.
Researchers say using
devices that emit blue light—including cell
phones and laptops—
before bedtime can
have negative long-
term health effects
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