I know what you are saying. I can't imagine 1800 mg of Gabapentin on a daily basis. My neurologist upped my dosage to 300 mg 3x daily. I eventually cut that back to 150 mg. 3x daily. I, also, tend to get very sleepy after dinner, often falling a sleep during a movie. It could also be the diazepam that I am taking. I may try to wean myself off both of these meds since I had a pain pump implanted. The pump doesn't give great relief, but I'd like to know if the meds are really helping after 7 years.