Have any of you tried melatonin gums/tablets?

I (15M), am having trouble sleeping at night, I usually sleep around 4 and wake up 2 pm. I’ve tried fixing my sleep schedule but I just can’t do it. I heard on the internet people take melatonin tablets or gummies to regulate the sleep cycle. Do any of you take it? If yes then how often should I take it and after how long can I see the results.