I've met people who share my situation where Oxy other opiods/opiates is our ritalin/adderall
When I drink PST I stay up all night and clean my entire house spotless down to wiping the sink faucets, getting behind the toilets, vacuuming two or three times to make sure every crumb is off the floor. PERFECTLY folding my sheets. Doing all the laundry, dishes, and so much more. While a lot of this is OCD (perfectly sheet corners, symmetrical rooms, etc) the energy that comes from doing it is from the tea. When I have no tea, I sit on my laptop all day and either look up things regarding chemistry or work on getting my CompTIA A+ Certification (as you can imagine doesn't take any physical work).
You just might be one of those people who feel more productive or more "ready to go" when you take opiods. I know you say you get home at 4AM, but truthfully I would take advantage of it - just my opinion albeit probably an unpopular one. If you can't go to sleep be productive!
Your body will eventually recognize "okay this is far too much, go fuck yourself I'm out".
Ranting only from my own experience,
-MF4M