I would guess that the ammonia from the parasites somehow causes a sleep disturbance. The Ornithine neutralizes it so you can sleep.
I gave some to my sister in law this week because she was having trouble sleeping. She tried four capsules two night in a row and she said that she had two good nights in sleep in a row. She also said that it help her hot flashes. She is not even doing any cleanses and it worked for her.
Have you tried ordering online from www.vitaminshoppe.com/?
I have bought from them before and they usually have lower prices then local the stores, their shipping charges are reasonable and they are usually fast in their delivery of the products.