insomnia
"I am in my seventies and my doctor asked me to try and wean myself off of Ambien by using this new drug called Belsomra. Last night using the drug for the first time I had the one of the worst nights of my life. I had horrific and frightening nightmares where I felt like I was awake but I couldn't get up and I never felt like I went into a deep sleep.  All day long today I have felt like I'm in a fog and my equilibrium is off. I will never use this drug again it is a nightmare in itself."