might find this of interest: Fibromyalgia treatment: Does Neurontin relieve symptoms
From what I know of neurontin and ambien, neurontin seems like it would be a better choice if it works for you.
Neurontin is also available as generic (or it was at some point, I think there was a legal battle, not sure how it turned out)
As it says in the linked article, it would be an off-label use, so there hasn't been much testing done in using it at night only - it's unclear if there are negative effects doing what would amount to a daily withdrawal from it (Gabapentin elimination half-life is 5 to 7 hours)
From what I know of neurontin and ambien, neurontin seems like it would be a better choice if it works for you.
Neurontin is also available as generic (or it was at some point, I think there was a legal battle, not sure how it turned out)
As it says in the linked article, it would be an off-label use, so there hasn't been much testing done in using it at night only - it's unclear if there are negative effects doing what would amount to a daily withdrawal from it (Gabapentin elimination half-life is 5 to 7 hours)