Maybe some people just enjoy working.
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.
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.