How "real" is reality, is a red herring, unless that makes any difference to any practical situation.
It could be all field resonances that we call particles, it could be a simulation, or it could all be in your dream. The point is that you can't control any of that. If it's your own dream, then it's a part of your brain you can't actually control. If it's a simulation then you don't have admin rights to it.
If you get shot, it will still hurt like hell. If you jump off the house you might break some bones. Simulated or not, it will still happen just the same.
Simulated or not, if you don't pay your electricity bill, your lights, computer and even fridge will stop working. Simulated or not, if you put diesel in a petrol car's tank, it won't work. Simulated or not, if you forget your dinner in the oven, it will get burnt. Simulated or not, if you plug your 110V laptop power brick in a 230V socket in Europe, it will at least blow a fuse.
Unless you can show that you can control any of that, then guess what? It still works by the same rules that we call physics. And in fact to make anything work, you still have to apply the same science.
If it's a simulation, then that's the rules that it's programmed with. If it's a dream, then that's the rules that that part of your brain sticks religiously to. If you want to get anything done, and/or avoid harm, you still better learn and apply those rules.
So essentially the whole exercise is pointless, since it makes no measurable difference whatsoever.