Earlier quoted context omitted.
Sleep has crucial role in survival and well-being
Yeah but what role? 24h always at least a bit running brain has also crucial role in survival. I get some form of maintenance is needed, but 8h every day seems like an overkill for very significant disadvantages. Many other mammals require significantly less sleep.
For humans, the benefits of adequate sleep, like improved focus, emotional regulation, and overall health, tend to outweigh the potential disadvantages.