I was the same way with Seroquel. By the time I stopped it to go on Clozaril I was requiring 1500 mg to sleep. It wasn't working for anything by that time so it was clearly time to stop. But I never was tired on low doses except for maybe a day or two when my dose was increased when I was titrated up to a therapeutic dose. I was on 900-1200 mg for years and that was required to sleep as much as control other symptoms.