nodding out


China Chinese

I'm reading Slash's (guitar player of a rock band GNR) autobiography: SLASH, Slash with Anthony Bozza. And don't understand some phrase in the book. Below is the passage, please help.
The process began with Paul coming down to our apratment to "discuss music." By this time heroin had become a daily thing, so when Paul arrived, Izzy and I were doing all that we could to keep from nodding out; just barely keeping it together enough so that it wasn't obvious ... or so we thought.

"nodding out" means falling asleep?

Thank you very much!
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