This has been going on now for about a month. I realize it is dangerous, but his tolerance must be huge. Could he overdose or just stay really messed up, which believe it or not doesn't act too bad. He just looks really glassy eyed the next day and moves slowly with some speech slurring. What can I do for him?

Tell him your worried about him. Maybe get him to switch to weed. At least that won't kill him. He's gonna crash sooner or later, be careful when that happens, he may get reallly depressed.

Definitely not a good combination of drugs to take like that. If these are prescribed for him he needs to get a different doctor. If he buys them off street dealers then he's going to take one too many pills one day and really mess himself up and/or wind up dead. Nothing to mess around with.

Eventually he will sleep without waking,this is common enough with people who fine solace with sleep(me for example)If you care deeply for him you must fine a way to get the idea across that he is going to kill himself by doing this,maybe intervention is called for?