I've been a terrible sleeper for about a decade. Weeks on end where I am only sleeping a few hours a night. Can't fall asleep, can't stay asleep, just tired all the time. Tried all the sleep hygiene recommendations but made no difference.

Started supplementing with creatine and about a month later had the best sleep of my adult life.

Shortly after switching creatine brands, I noticed my restless legs were back and I couldn't get to sleep. Switched back to the first creatine brand and a couple weeks later and I am sleeping again.

I don't know if the creatine helps me sleep. I started taking it because I heard on a podcast that it can help prevent cognitive decline as I age. I also started breathing through my nose when I try to sleep so maybe that was what made the difference.