I have been on Quetiapine for 2 years for insomnia. I take it before bedtime, and it usually takes 30 minutes to work. I wake up one hour later and want to eat something even though I'm not hungry. I've tried leaving a small snack by my bed, but it seems more like I just want to get up, even if I'm dizzy and lightheaded. After that I can go back to sleep and remain asleep for the rest of the night.