You might try some L-ornithine, a non-essential amino acid, rids the body of amonia a by-product of protein metabolism.

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here are some of the reviews related to insomnia:

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Based on the reviews I bought this product hoping that it would help me fall asleep and sleep through the night. I've tried many herbal sleep formulas with no luck. I also tried over the counter allopathic medicines, but don't like the idea of taking pharmaceuticals, nor do I like the drowsy feeling upon waking. I bought these and took 4 before bed the first night and to my amazement I slept through the night and had no trouble falling asleep. I've been taking this product now for 3 months and sleep through the night almost every night. In fact, it's the best sleep aid I've found.
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5.0 out of 5 stars Help me sleep better at night.
Reviewed in the United States on February 27, 2017
Verified Purchase
Taking these as a natural anti-anxiety remedy and they work great. I sleep so much better at night with 2 of these taken after dinner. A guaranteed 5 hrs sleep where before I woke up every 2-3 hours. That's good enough for me.
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5.0 out of 5 stars Good stuff
Reviewed in the United States on April 24, 2016
Verified Purchase
I don't have a hard time going to sleep but I do have a hard time staying asleep. I took 4 of these and slept all night long. Not only did I sleep all night, but I woke up without that feeling of hangover that you get after taking a night time sleep aid. Highly recommend!
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5.0 out of 5 stars Works for insomnia
Reviewed in the United States on June 9, 2019
Verified Purchase
I suffer from chronic insomnia and have tried almost everything on the market , perscrips, natural etc. recently I’ve used glycine and gaba and they have helped. However , ThIS is the best and you’re brain will feel happy and relaxed. Highly recommended!
//////////////////////////////////////////////5.0 out of 5 stars Helps with sleep
Reviewed in the United States on July 2, 2019
Verified Purchase
I read about using Ornithine in the Hulda Clark parasite protocol...when taken at bedtime, it helps to process the ammonia in your body, and allows for a good night's sleep. Very grateful for this!