Hi, I am coming off Risperdal after 3 months. Withdrawal symptoms seems to be slight insomnia, extreme irritability. As this is the 6th day, I'd say it is going to be some time. I'll let you know. In turns of insomnia, I took long walks in the regional parks and slept like a baby for 7 hours. It also helps if you are on a healthy diet and learn to relax and be happy. Good luck in whatever you are trying to do.