hi, i dont know if this message is to late, but i thought it still might help you. our doctrot recomendet melatonin also for our son, he is always very awake by the time he should go to bed
we give him a dose from 100mg 1/2 hour before bedtime, it helpes very good . but we found that he wakes now earlier up und is up right away. usally i have to kick him out of bed and it takes forever. so on weekends its not really nice when he is up at 6
we use it not every day, only if he is overstimming.
hope it helped