Ive been taking Quetiapine for about two years now. Ive found that it messes with my memory. I seem to keep forgetting things like appointments. As for sleeping, i still only get about 4-5 hours a night but always feel i have no energy all day long. I do get dizzy spells but i think thats down to lack of sleep :nahnah: by the way I'm on 600mg per day.