E-readers 'damage sleep and health'

[BECKHAM]

If you curl up under the duvet with an ebook for a bedtime read then you are damaging your sleep and maybe your health, US doctors have warned.

for more .... (http://www.bbc.co.uk/news/health-30574260#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa)