Yeh as bad as the lack of sleep is from meth thats something thats fairly easy to control.
There was times when I stayed up 6 days straight on meth and besides the hallucinations/paranoid delusions you get that shit will break your body down physically real fast. But the positive side is all you have to do is not dose when you want sleep. The meth wears off, you crash, and sleep for days.
Opiates however are far worse imo when it comes to sleep. Not as far as keeping you up when you're high (which they do for many people) but in regards to withdrawals. I remember coming off pods For 8 days straight I must have only slept an hour or 2 at most. I'd lay in my bed in a state of fatigue that made me feel like I just swalled 50 thousand somas... but still could not sleep. That is true miserable hell. And although I got some sleep on day 8, for the following 2 weeks I was sleeping at most 1-3 hours a night.
When you are that depressed, and that anxious, and that physically ill already, ON TOP of not sleeping for weeks at a time, that shit will fuck with your head unbelievably. Not getting sleep makes my blood pressure go up, worsens wds, worsens your emotions, your joints start to crack and ache, your vision starts to blur, your nerves start to "misfire", your body bloats with water, your motor coordination degrades, ability to talk, walk, and think effectively.
I think a lot of people can deal with physical pain, some people can deal with anxiety and depression, but a lack of sleep becomes a catlyst for so much other shit and thats really hell on earth. You wind up dealing with like 40 different problems all at once and that shit will cause stress more than anything I can think of.
Regardless of the drug that causes it, its pretty much one of the only symptoms that genuinely scare me the most. You lose the ability to shut your body off and control one of the most fundamental and essential functions of health. At least when you can't sleep on meth you're too high most of the time to really care. But not getting sleep in wds... I really can't think of anything worse.
Either way, it fucking blows. I feel for you, really. Just got done going through the shit myself.