I'm not familiar with those but the effect of Olanzapine has been described to me as being at high altitude or some other low oxygen environment where it makes you want to sit down, then lay down, not because you're sleepy it just suddenly feels like a pointless chore to be upright. The brain is in power-saving mode during this and all you feel like doing is to stare blankly into the wall.
Results differ from person to person, some won't feel as disabled, but there is a legit reason why some people with mental problems hates anti-psychotics and try to fight staff administering it. (friend of mine worked as a nurse at a psych ward)