I wouldn't completely write off Olanzapine straight away. I've been chatting with another member who's planning on using Olanzapine as an antiemetic as part of their SN regimen. Their experience with Olanzapine is it makes them quite sleepy when taken.
Olanzapine is a thienobenzodiazepine, they have very similar properties to that of benzodiazepines. I suffer from terrible insomnia problems, and at the moment, only benzos seem to solve it. While admittedly I haven't tried Olanzapine myself, they do sound like effective sleeping pills.