[Hyperbolic]

This makes no sense. It's not just that you might, for example, die at 70 instead of 75 if you don't sleep. The point is that your quality of life during those 70 years would be horrible, for all the points listed in the article.

[louprado]

But you could use caloric restriction to get some of those years back. You're probably near rock-bottom grumpiness/misery anyway so the cost is minimal.

[chimprich]

There's bound to be some level of trade-off. For example, you might be marginally better off health-wise to sleep for 8.5 rather than 8 hours but that's a lot of extra time wasted if the benefit is negligible.