Thoughts on melatonin for my 4 year old? READ EVERYTHING

Hi everyone. I'm wondering what everyone's thoughts are on giving my daughter who will be 4 in less than a week, melatonin.

I bought mommy's bliss melatonin for kids and it says to give one gummy for kids above the age of 3.

My daughter's bed time is 9pm and she will stay awake until midnight no matter what I do. She is also an early riser no matter how early or late she goes to be.

Yesterday was her first time taking the gummy and she was asleep within half of hour of her being in bed, same with today. She also woke up and was like a different child, much happier, ate better, was less fussy etc.

Thoughts?