Sleep needs vary. It depends on what's normal for you. But if you don't really have a 'normal' then I'd say, hmmm, over 9 hours? When my son came out of the hospital on 35 mg of Zyprexa, he was sleeping like 12 to 14 hours per day. His pdoc said 8 or 9 hours was good. Anything higher meant his dose was too high.