Sleep is super important. I’ve seen too many workaholic types that barely sleep. So many of these folks end up with serious issues later in life.
One can't escape psychology, one thing no school taught me (and they should have since we all deal with this in some way! plus its not that complex). Once I grokked the basics, dealing and with people and understanding them became much easier.
What about people who are deeply passionate about their mission and chose to devote their life to it?
Addiction is pathological, it has to do with self control, often a degree of chemical dependence / reliance, and how one prioritizes things in one’s life.
If you work all the time, but are otherwise generally happy and healthy, passionate and devoted to your mission - that’s not workaholic. That’s just living your best life.
Maybe alcoholics do enjoy drinking. But working 60 hours a week isn't going to cause brain damage and liver failure on its own. Productivity isn't a chemical or vice.
If it causes you to sleep too little, it just may.
If there’s no net-negative, there’s no addiction.
So yes, some people just enjoy working. Others are workaholics. It’s not all-or-nothing and the evaluation depends on how you calculate the net impact of work on the person’s life.
What OP was calling out is that chronically sacrificing sleep seems to consistently take its toll down the road. So chronically enjoying work at the expense of sleep can be a form of workaholism.