Ok, So I Have Been To My Doctor Latley, And Said I Should Take Melatonin Because I Can't Sleep Too Well. I am 10 Years Of Age, And Looking Forward To Be A Doctor When I Grow Up. I Mean, Why Not Start Early? But, Back Onto Topic. I'm Wondering What Mg Amount I'll Take. There is

1 mg, 3 Mg, 5 mg, and 10 mg. What Should I Do?