insomnia
"I was put on 300 mg at bedtime for better sleep with spinal pinched nerve, along with chiropractor care. At first the sleep effect was awesome - no crazy dreams like trazadone, and no super quick tolerance built like ambien, just good and regular sleep. However, after a month and going up to 600mg for nerve pain it bizarrely started to cause insomnia! The worst part about this med is the brain-erasing characteristic. I thought ambien damaged my memory, but this far surpassed that because it lasted in the day to the point where I couldn't remember where things were or what day it was. My father takes it for spinal stenosis too and has no issues. Also, the posts about withdrawal syndrome are very real! It was hard to wean off."