insomnia
"I have chronic back pain that I take a pain medicine for. (Nucynta- and it'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't know it's working until you lie down and try to go to sleep. This pill doesn'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'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 "