A 55 yrs old male schizophrenic pt on long term treatment(15yrs) and currently on clonazepam, atypical antipsychotic,trazodone hcl and zolpidem has developed dependance and he has also developed chronic insomnia and unable to sleep even a single day wuthout these drugs otherwise symptoms are quite under control with these medications.what should be the management of chronic insomnia in dis pt and how to taper of these medication to prevent other adverse effects??