insomnia
"You cannot be on Ambian and switch to this drug. It does not work on the same receptors and you will go into Ambian withdrawal in the first night,  and blame in on this. I've been on Ambien for 2 years and been through withdrawal several times. Nightmares, muscle shocks and a quick dream of getting punched in the face that puts you in state of being afraid to fall back to sleep. 0 hours of sleep my first night. I went to work while having hallucinations. Don't blame the new drug, blame that it's being advertised as being an alternative."