Er, yeah, however most people will be call it fatigue, stress, depression, rather than exhaustion, and to be fair, will probably get on with their days. For the most part, a standard 9-5 mon-fri job isn't going to give you exhaustion.
I was off work for a month with exhaustion once, I was working 16 hour days, 7 days a week, and in the in between times travelling. Sleeping on the bus, eating and drinking as and when.
It doesn't mean you are on drugs.