Gabapentin
"I was put on gabapentin right after back surgery on my L4 L5 S1 S2 lower lumbar spine. After 2 years from surgery I still remain on this medicine due to permanent nerve damage.  This medicine managed to calm my nerves at night and get rid of the pain allowing me to fall asleep.  I am on 200 mg a night but sometimes only need 100mg.  It has been a lifesaver.  I don't take this during the day due to the drowsiness side effect but it works wonderful.  I do wake up extremely thirsty though."