Just the presence of a smartphone or device is enough to disturb children’s sleep patterns as they anticipate the possibility of getting a message and can’t relax.
Using devices at any point in the 90 minutes before bedtime more than doubles the risk of a poor night’s sleep. Even leaving it charging in the corner can have a detrimental effect, possibly because children are subconsciously engaged with them if they know they are within earshot.
Researchers ta Kings College London examined the digital behaviour of 125,000 children across four continents. It’s known from previous studies that around three-quarters of children and adolescents have at least one device in their bedroom at night.
Screen-based media may adversely affect sleep in different ways: psychologically stimulating the brain, delaying or interrupting sleep time, and affecting sleep cycles, physiology and alertness. They effect both the quality and the duration of sleep.
Sleep is undervalued but…
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ulearn2bu 
It really doesn’t make any difference to the child if you first give them a good hard smack on the head with a rubber mallet…………they will sleep well irrespective of a mobile being in the room!
can you still do that kind of thing over in Yorkshire?