How to get sleep after drinking?

Hi all, So I drank tonight and I’m not really a big drinker. Like once a month or so. I had 4 drinks over 3 hours and then stuck to water for the last couple hours. It’s been 6 hours since my last drink, I’m not even slightly intoxicated at this point and yet I cannot sleep for the life of me. I stopped drinking at 2am and it’s 830am now, wide awake. Any tips to fall asleep? I’ve been drinking water, ate some food, and took a shower. Is it safe to take something like melatonin at this point? Any advice would be greatly appreciated!