what is Sleep Apnea? What are remedies and medication?

Get up 3-5 times for urination and mucas is struck up in the throat. i go to sleep in office and while driving.

Is there any prescribed sleeping medication that can be used if you have obstructive sleep apnea?

I use bi-pap, but am still unable to sleep. I thought I read somewhere that there is a prescription sleeping pill that is safe for peopel with obstuctive sleep apnea to use.