There have been reports about people who didn't sleep at all for many years, see e.g. this newspaper article. The case of Paul Kern is the subject of this Wikipedia article, and this newspaper article. So, it seems that there have been a few people in recent history who seemed to have managed for years without getting any sleep at all. Now, there are good reasons to be skeptical on physiological grounds and the lack of rigorous proof that demonstrates this in the lab.
The question is then if the counterarguments are strong enough to cast doubt on these case. After all, out of the many billions of people that have lived since the mass media would be able to pick up such stories, only a few cases have been reported on. So, the arguments against this being possible must be very strong. On the other hand, there is a lack of such cases in recent decades, which suggests that with modern diagnostic tools one can actually detect that people with severe insomnia actually do sleep.