What can I take to really help me sleep tonight?

I’m just looking for something I can take to help me fall asleep for tonight, and tomorow night and that’s it, I never do anything like this nor will I start. I don’t have sleeping problems. I just need to catch up on my sleep, and I took a nap today, and when I take naps in the day I have a super hard time falling asleep.

This is something I can’t afford to risk because I have a huge speech that I need to be refreshed and awake for. So I was thinking taking something like “Melatonin”? what do you think?

P.S. I’d much rather take something natural if possible, but if I’d be willing to take something non-natural.