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I don't think any of those actually do not sleep. They probably sleep less than normal and skimp on sleep, but i have a hard time believing that they actually do not sleep at all.

They have a different gene expression which leads to them needing less sleep.

They could also be liars.

We microsleep whenever we blink. Or at least that was the old science, maybe there’s a new explanation.

I've never heard that, it doesn't really make sense given what we know about REM sleep and slow-wave sleep, and the Wikipedia page on blinking doesn't mention that at all, not even as an old theory.

[citation needed]

Cocaine and amphetamines, for a lot of them ;)

Stimulants and embellishment (potentially inadvertent)