you may not want to do that since both drugs make you drowsy and also slow your breathing and heart rate (Also, please see the EXCELLENT answer to "Is it OK to mix Percocet with Ambien"). I agree...
I've been on morpine sul tabs 4x a day and norco 7x a day for breakthru pain.. I'm not dead yet and it's under my pain specialist perscription. It seems to work for my pain so far...