Meaning?

Hi,

What is the meaning of "you ever come close to ending it all ?" and"pass on the bit about waking up" in the following text?

"All of us vow that we'll not be taken alive. ....But it's not always that easy. Men are often wounded first and unable to shoot themselves. Sometimes they're asleep and surprised. And often, Banning, I think that we become so adapt at survival that we believe we can survive anything, so we drop our guns, raise our hands and are led away. Usually ,I suppose, within hours there is an awful feeling of regret. You ever come close to ending it all?"

"Many times "Pete said. "The thirst and hunger drove us all crazy, along with constant killing. I thought that if I could only go to sleep, then I would pass on the bit about waking time. But we survived, we are surviving now. I plan to go home, General."

Thanks.