In the event you’ve ever had trouble falling asleep, odds are you’ve heard about (or tried) melatonin as a way to unravel your insomnia. There are a multitude of ways to eat the sleep aid — from pills, to gummies. But melatonin diffusers, also known as vape pens, are the latest additions to the arsenal of products promising higher shut-eye. The primary melatonin vape was introduced only 5 years ago. Because they’re so new, there aren’t many research on the…