Clozapine (Clozaril) has fewer of those issues and, loxapine (Loxitane) is one of the very early not widely used non-classical AP's. Both are associated with lesser EPS and Movement disorder incidence. That can include akathisia which, if it presents in someone who already cannot sleep... eeks.

Clozapine and loxapine are both new generation but not universally considered atypicals - there is controversy. some say yes, some say no - it depends whom you ask, what you read, and which country you're in. i have seen loxapine called "paratypical" in one place. In any event both drugs are overall safer than the classical APs. Chemically, both are dibenzazepines like olanzapine (Zyprexa) and quetiapine (Seroquel), but they are both of different sub-classes, have significant structural differences, and were developed earlier on.

I took loxapine 10mg qHS for about a year and then PRN to help with sleep. I personally had no side effects.

So i guess what i'm saying is, if it were me at risk for diabetes and couldn't sleep, before gobbling haloperidol, i'd opt for clozapine or loxapine for a short term treatment... but the situation is complicated by the deal with the Klonopin. Everything considered, i would want to see your friend under medical supervision, whatever she is going to take, and i would want a doctor involved in that decision also, who should be of course made aware of her genetic diabetes risk.