Hey! I ended up reading some of the literature myself, and I have to say it would not be peaceful and painless. First of all, death is not a guarantee, and it is a hazardous psychotropic. Long story short, if you've ever read about deliriants like Datura or DPH, that's what your final moments would be like :( and if you don't die (which mind you is very possible even if you try mixing it with depressants), it is very possible you might be stuck with psychosis, HPPD, or the like:
"Zolpidem has been reported to cause
psychosis,
delusions and delirium at a significantly higher rate than other
hallucinogens like
LSD,
ketamine, or
DMT. There are a large number of experience reports online which describe states of delirium, amnesia, bizarre behavior,
[12] sleep walking,
[13] driving while impaired
[13][14] and other serious consequences after abusing the drug. In many cases this has resulted in hospitalization, arrests,
[15] car crashes,
[16] lengthy court cases and even death.
[17]"
https://psychonautwiki.org/wiki/Zolpidem
But yeah uh, don't overload your GABA receptors as a way to CTB, it could have very serious consequences. I hope this helped.
And btw, I like your profile picture. I see you're a person of culture as well :). I guess you can say don't try to CTB this way if you don't want to potentially end up a Fuminori