Can geodon (ziprasidone) be used to treat severe insomnia?

No: Geodon (ziprasidone) is an antipsychotic. While sedation may be a side effect, it's not a medication used to treat insomnia. See your psychiatrist, and get your psychiatric issues stable/controlled. If you still have insomnia after that then referral to a sleep specialist may be in order, where a more thorough intake will determine the next best course of action (e.g. Cbt-i, etc).

Thanks for asking!: Geodon (ziprasidone) can have many side effects. There are sleep medication with less severe side effects. Consult your psychiatrist.