Does anyone else experience oversleeping on Seroquel/quetiapine?

Yeah I'd say excessive sleep is normal for Seroquel, but 12 hours per night sounds on the higher end. I've been on as high as 800mg per day, and now as low as... well, about 1/4 of 25mg (6-7ish mg), and I got used to needing at least 10 hours of sleep to feel normal, generally speaking, starting at about 100mg and higher (I could get by on less time if needed but always noticed some "hangover" effects). Over the past year or so I decided I wanted to take back my life in a sense, which meant having to come down on Seroquel. Even with a dose as low as the one I'm on now (under 10mg), I still sometimes feel like sleeping for 9+ hours. The only thing stopping me now from ceasing it altogether is the itchiness (it's an antihistamine so you get itchy when you stop taking it, if you have been on it for a long time). One nice thing about Seroquel is that it makes you sleep for a long time (great for insomnia). The bad thing is that it often makes you sleep for too long, or if it doesn't, you may sleep 7-10 hours and then still feel groggy or have a foggy kind of headache the next day (something you wouldn't experience without the Seroquel).