Problem in under calling are smart-devices.

 If to talk about circadian rhythms, thus in smart-devices are having two wrongs, which affecting on destroying inside natural rhythms of organism, as radiation from the screen, from  phone, and his antenna. Sm not stopping on the still one minus are reflexes destroying and processes for using and over digesting meal, when adult or children eating sitting before computer with a phone in hand, that themed need in big detailed discussion big.

 Smart-screens are emitting clear light , natural part  of visible light spectrum, and he's needing for regulating circadian rhythm as cycle fore for sleep and wakefulness.But,  on the level artificial affecting of blue colour,which from affecting since birth till adult, today is simply unprecious, our bodies paying for this a high price. And its evidenced,that chronic affecting of artificial light its having a far going consequences for health, children's are most affected for risk.

And here are a few interesting static dates from Australia:

Teenagers using much time before screen as tv, computer, notebook, playing gadgets, phones, or iPads, than other age group.

Children's on 6-12 y.old are using this for 32 hours/week.

Children's on 2-5 years are using screen for 26 hours/week, and babies on 14 hours/week,

Also, 85 perc.of children's on 6 y.old and younger, as admitted, that using screens to attract attention of an own children's.

 Also,in addition of an abundant using screens, children's are learning, living at home with an energy saving clear light diode lamps, and lots of parents using light diode lamps, when babies are small, such artificial light having a small visible part of light spectrum and not having a big other spectrum part, which our organism within 100000 years habit to get with sunlight. A children's are most sensitive to the blue colour, that adult, that theirs eyes a full development to 14-14 years. Lens is a flexible lens  behind a rainbow membrane, allowing regulating sharpness of vision , in children's he  is most transparent, but in children's are bigger pupils. Thus , theirs eyes not protected and ability to perceive a most power waves  of high energy blue light.