insomnia
"First night on 10mg didn't fall asleep until 5:15 am after 4 am popcorn binge. Woke up about 7:30 am. Same on next 3 nights with middle-of-the night coffee-cake, chocolates and even a couple of frozen dinners. Dr. upped  to 20mg. Same result. Hardly any sleep, night snacking, and started eating more during the day. People have commented about rapid weight gain. They're right. I gained 8 lbs. the first week! My weight has been pretty consistent by 2-3 lbs. for years. Going back to Ambien!"