Yes, talking about this to your doctor is important, as a good answer depends on such factors as the precise diagnosis and why these specific drugs have been chosen, and what effects are desired from them. Zyprexa is a trade name for the drug Olanzepine, which is used in the treatment of schizophrenia and other psychotic disorders, and also in bipolar depression. Leponex is a trade name for the drug Clozapine, also used in treating psychotic disorders.
Both these drugs can be sedative ; useful if one has insomnia among one's problems, but it can be a nuisance during the day when one wants to be alert. I don't see any obvious reason why not to take both meds at night, but maybe your doctor does have a relevant concern in mind.
You haven't mentioned how long you have been taking these meds : with many meds, side effects like sedation are most noticeable in the first weeks, before one's body adjusts to their presence, and may then become less troublesome.
There may be alternatives he could consider, but this would also depend on which of these, if any, you may have tried before.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.