insomnia
"Suffered from insomnia for ~5 years before being prescribed Zolpidem 10mg. It took about 15 minutes to work and it put me to sleep very quickly. After ~1 week I built up tolerance and my doctor increased my dose to 20mg before bed. This gave me increased side effects - seeing double, increased drowsiness the morning after. I would also do/say things I had no memory of, and sometimes I wouldn't be able to tell if what I was remembering was a dream or whether it actually happened. Overall, it put me to sleep but the side effects were quite severe. A very good treatment in the short term, but it starts to mess with your sense of reality at higher doses once your tolerance builds up."