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One of many explanations for their brain damage I suppose.

Some people just don't need that much of it and the whole idea that everyone needs the same is actually torture for them. I don't need much at all and sleep later and during school the idea that you have to all start at the same time it becomes hell of you laying there for hours and just not being able to fall asleep but then getting more and more stressed knowing you're risking oversleeping or just being exhausted when really just accepting that you can't really sleep before 2am so there isn't point trying will serve you better.

Google Delayed Sleep Phase Syndrome

DSPD (circadian cycle usually 1 hour longer than normal, and a preference for sleep onset hours later than normal) is unrelated to needing less sleep.

But you are correct that some people do not need as much sleep. This is genetic.

I have both issues so guess always lumped it together.

DSPD sufferers often get less sleep by virtue of waking up to an alarm clock. Usually they need more though.

Typical reply to an "I do/I don't" stance is "It shows".