Probably is the Zyprexa, but I think you might wish to call your psychiatrist and let
him/her know that you're having a difficult time of it with sleep that's inadequate.

Please call your doctor and request help; there's a quick solution to it if you just have the right meds.

Zyprexa can cause nightmares for some. Makes me wonder if you're avoiding sleep because of the possibility of nightmares? If that's it, request another med.

I find the antihistamine Zyxal is effective. (It's doctor prescribed 5 mg., 1
nightly. It's a concentrated form of Zyrtec and very helpful for restful sleep.)

Bipolars build up histamine in their systems, in my view, and it disturbs sleep when
it gets too high. I hope the problem is nothing more than something of that sort.

Please keep a regular sleep schedule, too. This spring season (with its bright sunshine) can have a negative effect on your sleep. Try wearing sun glasses in the afternoon and avoid too much bright light from tv in late afternoon and early evening.

Circadium rhythms enter into the picture, too, so you need to get things stabilized for you and be comfortable in your home for a nightly routine rest schedule.

Take care and keep in touch, please.