If you use a tablet before to go to bed, will it cause insomnia? Will it cause cancer?

Read More:
Do e-readers really harm sleep? Depends what you call an e-reader

Do e-readers really harm sleep? Depends what you call an e-reader


“A new study has claimed that light-emitting e-readers ‘negatively affect sleep, circadian timing and next-morning alertness’ when used in the evening. However, those reading the resulting coverage should look into the details before worrying too much.”

Light-emitting e-readers before bedtime can adversely impact sleep
http://www.eurekalert.org/pub_releases/2014-12/bawh-leb121714.php
“Use of a light-emitting electronic device (LE-eBook) in the hours before bedtime can adversely impact overall health, alertness, and the circadian clock which synchronizes the daily rhythm of sleep to external environmental time cues, according to researchers at Brigham and Women’s Hospital (BWH) who compared the biological effects of reading an LE-eBook compared to a printed book.”

Melatonin
http://en.wikipedia.org/wiki/Melatonin

The Truth About Tryptophan
http://www.webmd.com/food-recipes/features/the-truth-about-tryptophan?page=3
“Is it possible to have too much tryptophan in the body?”

Regulation of arylalkylamine N-acetyltransferase (AANAT in the retina
http://www.ncbi.nlm.nih.gov/pubmed/16687311
“Melatonin synthesis in retinal photoreceptors is under photic and circadian control and is regulated primarily by changes in the activity of arylalkylamine N-acetyltransferase (AANAT).”

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