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Posted by RichardMVickery on 06 Sep 2016 at 07:10 GMT

"italic" In the hours prior to bedtime, reading a book on a light-emitting device (LE-eBook), compared to reading print, increases evening alertness, thus reducing sleep latency [21], an effect which is attenuated when using blue blocker glasses [22].

The Chang et al. study [21] says "italics" Participants reading an LE-eBook took longer to fall asleep and had reduced evening sleepiness. This means that their sleep latency (time taken to fall asleep) was "bold"increased not decreased.

No competing interests declared.