When my nephew was unemployed, he had an accident and was hospitalised for a couple of days, the JC were fine about that and didn't sanction him but the consultant said he had to have bed rest at home for two weeks (he had a tear in his brain lining) - his GP would not give him any sort of sick note by phone and he couldn't go in, JC would not accept this information by phone. So, he was sanctioned, for a month. And that was the only money he had coming in.
The accident was not his fault, he had been looking for work until then, he was unable to pay his rent and was lucky not to be evicted. My sister managed to pay his rent. But that's not the point.
It was a very scary time, he has a tendency to depression and was (is) a youngish man who was unemployed, so we were really worried about him - not long after that my sister got an incomprehensible call at 2am one night and she and BIL had to dash to him and they took him to the GP the next day where he was given anti-depressants.
This was a few years ago and he has a good job now but it was a very worrying time made a LOT worse by the stupid sanctions system, it wasn't only him it affected but us, his gf, both extended families worrying about him etc.