This is a very good question.Yes, low zinc levels have been blamed for some forms of sleep disorders in children,but so have low iron and vitamin B levels as well.You also may be correct in saying that your grandson's disruptive behaviour during the day may be due to sleep deprivation. You certainly cannot lose by giving him a zinc and vitamin supplement such as Zinplex for a trial period of at least 2 months.
If there is no improvement in his behaviour and sleep pattern then you should consider the possibility that he may have the symptoms of ADHD.Start him him Omega 3 and 6 supplements and seek medical help if his problems continue.
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