I Have Been Prescribed IC Iophen-C NR For A Severe

I have been prescribed IC Iophen-C NR for a severe dry / unproductive cough, with hopes it would help me sleep at night ... But after two successive nights of sleeplessness (much of it caused by the dry coughing), I get no relief or help in sleeping. So I have been exploring of possibly the codeine is integrating with something else I'm taking