10 mg plant-based cannabinoids per serving. Plant-Based Cannabinoids + Melatonin: No sweets before bed is usually a good idea. But with Charlotte's Web sleep gummies, you can make an exception. Packed with a blend of hemp's naturally occurring and beneficial phytocannabinoids and melatonin, these bite-sized chews ease and calm you into blissful slumber. Get to sleep stay asleep and wake up rested and ready for a new day. Talk about pretty sweet.