I've taken Kavinace in the past, but for the life of me can't remember if it was helpful or not. I was taking a whole bunch of things for sleep at the time.
If you're doing supplements, a cocktail hitting various neurotransmitters will likely be necessary.
If you learn self-muscle testing, you can test for tolerance without even opening the bottle. There are several videos on Youtube that show how to do it. This has become the most used tool in my toolkit.
I have no problem with sleeping now because I have addressed all hormones and nuerotransmitters. I was using Travacor and that was excellent, it has 5HTP. I now just take 5HTP..
I do take Adrecor every day, same company. LOVE the products there! I am guided by doctors so I have not tried things on my own. It is hard to say if it will help you. It depends on the reason you have sleep problems. I had to get my hormones all balanced first with the Dzugan Method, then addressed other things.