POTUS keeps mentioning that the WhiteHouse is working round the clock
He drops that in every press conference and I don't think he is exagerrating.
I think he is asking us to dig, and this is what I found.
Note, that it is more than just breaking up your sleep schedule but also about keeping alert and healthy even though you have less total hours of sleep.
https://www.supermemo.com/en/archives1990-2015/articles/polyphasic
The Uberman's Sleep Schedule
The idea behind the Uberman's Sleep Schedule is to gain waking hours by sleeping the total of just 3 hours in 6 portions distributed equally throughout the day. There are many variants of the scheme proposed by those who tried to sleep along the schedule. The schedule is supposed to compress physiologically less important stages of sleep and homeostatically upregulate stages vital for mental health.
The Uberman's Sleep Schedule was proposed in this blog at Everything2. The blog reported a sleep experiment with an innocent ending: the admission that the Uberman schedule was incompatible with the experimenter's schedule and goals. Yet the meme was picked up in a Kuro5hin article in 2002. Phrased in a simple and well-structured language, this time it was noticed. Again, the post ended with "Uberman's sleep schedule is a potentially dangerous way to increase your waking hours". That did not prevent a frenzy of new followers ready to gain years of waking time. The catchy theme of the concept is that, indeed, if you succeeded in sleeping 3 hours per day instead of the prescribed 8, starting at 20 years of age, you would gain over 11 years in an average Western lifespan. The idea is very attractive. No wonder then that as such it seems to be gaining momentum.
Polyphasic sleep
More and more frequently, Uberman's Sleep Schedule was being referred to as polyphasic sleep (the term popularized by research and book by an Italian chronobiologist Dr. Claudio Stampi).
Polyphasic sleep is known to sleep researchers as a variant of a sleep pattern that is set in opposition to monophasic sleep. In monophasic sleep, an individual or an animal sleeps in a single block during a single wake-sleep cycle of 24 hours. Polyphasic sleep is also set apart from a biphasic sleep in which there are two blocks of sleep in 24 hours, i.e. the night sleep and the typical Latin siesta - the "6th hour nap".
Polyphasic sleep is quite widespread in animal kingdom. In a recapitulation of phylogeny, human babies also sleep polyphasically, and gradually lose their nap slots until they become roughly biphasic around the age of one. Human adults, as much as all great apes, are largely biphasic. Although a majority of westerners do not nap on a regular basis their alertness shows a slump in alertness in the middle of the subjective day. This slump can consolidate in a short block of sleep in free-running conditions.
The theory behind the Uberman's Sleep Schedule is that with some effort, we can entrain our brain to sleep along the ancient polyphasic cycle and gain lots of waking time on the way, mostly by shedding the lesser important stages of sleep (e.g. shortening Stage 1 of NREM, which seems to be just a transition state to the more "useful" stages of slow wave sleep).