I think you missed the main point of my comment:
"you go to sleep and naturally wake up whenever your body feels like (nothing interrupted the sleep)"
Those that complain that they have experienced interrupted sleep (e.g. with kids, medical profession, etc.) and prefer uninterrupted sleep are missing the point.
The article talks about "segmented sleep", let's say you sleep 4 hours at night and 4 hours in the day.
In other words, you go to sleep and naturally wake up whenever your body feels like (nothing interrupted the sleep), then get active, the go to sleep again and naturally wake up again (nothing interrupted the sleep), then get active again. Rinse and repeat every day.
A car analogy (electric car):
Charge up the batteries
do errands
Charge up the batteries
do more errands
This would guarantee that all errands are done at almost full power and speed.
If instead you:
Charge the batteries
Do lots of errands
The problem is that probably the last errands will be done with less power and speed as the batteries are almost drained.
"interrupted sleep" would be like losing power so can't fully charge the batteries in the above examples.
I came, I saw, I deleted all your files.