What is the most powerful non benzo drug for sleep?

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So as the title States, I would like to know what the most powerful non benzo drug is that provides a knockoit effect to help sleep.  I have been on every benzo including midazolam for sleep and am desperate for something else. I have built a huge tolerance to both hypnotic benzos as well as the z drugs such as Ambien. If I told people how high my tolerance to drugs like midazolam is, you guys will thing I'm lying. I'm wondering what the most powerful sleeping drug that isn't a benzo is. I would prefer if it didn't have permanent or severe side effects. Thank you so much in advance everyone.