Creatine - It won't help you sleep - It will help when you don't get much sleep
I've struggled with poor sleep quality for over 10 years. Tried everything, nothing worked. When 10 pm rolled around, I would feel wide awake and fully energized...when it's time for bed. The following day, I would be in a haze and dragging myself along the entire day.
3 months ago, I started training with heavy weights and started taking creatine daily at 5 grams. Creatine is one of the most researched supplements and is 100% safe. Your brain and liver make it.
While it does not help with improving sleep, I found that the days when your struggling from lack of sleep or poor sleep quality, creatine has been absolutely great. No more heavy head or brain fog.
It has been a game-changer for me, when I have poor quality sleep (which is mostly every night).
I highly recommend it. Again, it is 100% safe. You could research online and specifically check out Dr. Rhonda Patrick on youtube. There are studies that show creatine significantly helps with both building muscle and cognitive function.
You might want to consider taking this supplement, if you're sleep deprived.