I would think that, given the capability to have light after the sun has gone down for hundreds of generations (candles have been around for ~5,000 years), any such trait would have become much more than an outlier by now.

Even if it is a positive evolutionary trait, that doesn't help anybody today. The 4 hour sleepers are still outliers, and the rest of us still need that sleep to operate at full capability.

I wouldn’t be surprised if needing more sleep is a competitive advantage. Increased brain activity leads to increased garbage collection and resetting.

Perhaps the short-sleepers have a concurrent garbage collector ;)

Or just more garbage. The trait might not really be adaptive - the cost might be worse memory for example.

Anecdote time. I know one person who matches the description of someone with the gene for not needing sleep. He’s an extremely high functioning individual.

Seconded. The only person I know who sleeps like this is also the highest functioning person I know.

How? Are you planning to prohibit the rest of us from procreating?

Relax, we can still procreate with the short-sleepers.