I've been taking zyprexa for awhile, I've slowly been decreasing the dosage and I've noticed its much harder for me to get to sleep. I think it does cause insomnia!
It is probably not a good idea to use Zyprexa (which is an antipsychotic) as a sleep aid. Zyprexa can cause both sedation and insomnia. The dose you took is relatively small, but it can still cause side-effects and withdrawal effects. Did your doctor prescribe this to you? If you are having trouble sleeping, there are many other techniques and medications that can be used.