It's not ideal for long term health and longevity, but necessary for someone who is very capable and has important duties they could benefit greatly by having the extra time for. In terms of missing things by sleeping at those points within the day, it also would have to be someone who can micromanage their time and has an awareness of people's cycles on some level. Napoleon and Tesla did it as well. You can only really achieve it with advanced spiritual practices otherwise it's totally damaging.
There's also the Biphasic one if I remember right, and the others. If you need more time in a day for important works but aren't too hot on that intensive level of day to day being, you'd want to try them instead. Certain people who want more time in the day awake when they look into this, in my opinion its the same as the average person with no real goal who wants to live forever. They don't even understand how depressing that would be for them. If you did a uberman sleep cycle and had all that time with no foundation of working for the Truth you would feel like ass and probably cause yourself health problems.
I feel like people who will have done that before successfully for a while, going to sleep normally would have been like a war veteran returning home from the Great War. I don't really think it's for the average person. The war veteran was still shellshocked afterwards, I wonder how a person with middling and average intensity would deal with it, lol.
On a partially unrelated sidenote, I personally believe with the Gods, they actually have it where they do not require sleep as they actually have the cognitive ability to perform the sleep functions in some sort of state which is beyond our dimensions of perceiving and thinking but basically like an empowered trance state. The function of sleep is a required thing, it's like the nightly death action the mind does. With an advanced race of beings who have overcome death, I bet they even have overcome that death of the mind that we have every night. They can balance that polarity.