There are multiple medical program resources for your motor carrier clients and commercial driver examinees available on the FMCSA website.
Is there a publication in simple terms that the motor carrier can hand out to it’s drivers to try to get those with issues, such as sleep apnea, to get the issues addressed ahead of the exam?
Here are some that I find useful:
Sleep Apnea (multiple pdf handouts)
Medical Program FAQs (Useful for Medical Examiners also!)