insomnia
"I have many incurable diseases that are very painful. One of those is called Fibromyalgia. When you have Fibromyalgia, you rarely-if ever go to Stage 4 sleep. Without Ambien, I can be awake for 2-3 days. In pain, exhausted, crying and not able to sleep.
I have been on all OTC medications for sleep. I have also tried Ambien CR (which for some reason doesn't work at all for me), Lunesta, Sonata, and chloral hydrate. (For those who don't know Chloral Hydrate is VERY strong). None of those worked. Ambien does!"