Insomnia
"I have chronic back pain that I take a pain medicine for. (Nucynta- and it&#039;s great!). I still had a problem with falling asleep so my pain doctor suggested I try this. It has changed my life. It is so amazing how it works. You really don&#039;t know it&#039;s working until you lie down and try to go to sleep. This pill doesn&#039;t give you the normal feelings of getting sleepy like the others. This is working your brain to shut down in such a cool way you hardly know it unless you stay up waiting for that feeling. I think if I didn&#039;t have the back pain I would probably sleep straight through the night but my pain meds run out after 5hrs so I have to take one again for that. No probs going back to sleep. I get a lot of memory loss on the night before though. 
May have bin the "