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https://www.25doctors.com/4-hours-of-sleep#:~:text=Getting%20only%204%20hours%20of%20sleep%20per%20day,deliberate%20effort%20to%20ensure%20you%20get%20enough%20sleep.
https://www.webmd.com/sleep-disorders/features/what-is-segmented-sleep
Most of us sleep the same way. Collapse into bed in the late evening, then spend the next 8 hours -- if we're lucky -- dreaming and snoring until the alarm rings. But that's not how everyone does ...
https://lifehacker.com/how-to-stay-productive-on-a-4-to-6-hour-sleep-cycle-1477407799
This post originally appeared on Medium.. I read an article today about a 22 year old who has spent the last two years living on 4.5 hours of sleep …
https://www.wikihow.com/Get-Through-the-Day-on-Less-Than-Four-Hours-of-Sleep
https://insomniacoach.com/forums/topic/wake-up-nightly-after-3-4-hours-of-sleep-but-never-go-back-to-sleep/
Falling asleep is easy. But after waking up after about 3 hours, it is impossible to fall back asleep. I think the sleep drive is just gone from there (still feeling tired, but not tired enough to sleep, so I’m just resting for the rest of the night). You once mentioned that most of the sleep drive will be gone within the first ~2 hours of sleep.
https://www.healthline.com/health/irregular-sleep-wake-syndrome
If you have irregular sleep-wake syndrome, you likely sleep for under 4 hours at a time. You may have several sleep sessions within a 24-hour period.
https://www.sciencealert.com/humans-used-to-sleep-in-two-shifts-maybe-we-should-again
It took some time for their sleep to regulate, but by the fourth week, a distinct two-phase sleep pattern emerged. They slept first for 4 hours, then woke for 1 to 3 hours before falling into a second 4-hour sleep. This finding suggests bi-phasic sleep is a …
https://www.youtube.com/watch?v=eZnNgnPuQk0
Researcher Ying-Hui Fu has found two rare genes that allow some people to be "natural short sleepers" who feel rested after a mere 4 or 5 hours per night. WI...
https://neurosciencenews.com/sleeping-duration-cognition-19602/
Overall, the researchers found that sleeping less than 4.5 hours and more than 6.5 hours a night – alongside poor quality sleep – was associated with cognitive decline over time. Interestingly, the impact of sleep duration on cognitive function was similar to the effect of age, which is the greatest risk factor for developing cognitive decline.
https://www.health.harvard.edu/staying-healthy/top-4-reasons-why-youre-not-sleeping-through-the-night
One of the common causes of disrupted sleep is lifestyle, including any of the following habits: Drinking alcohol within four hours of bedtime. A nightcap may help you fall asleep, but it also can interrupt sleep later in the night, and can also cause more trips to …
https://brightside.me/wonder-people/how-i-decided-to-sleep-4-hours-a-day-to-have-time-for-everything-443010/
Leonardo da Vinci, Nikola Tesla, Salvador Dali, and many other geniuses were said to sleep from one to 4 hours a day according to the system of polyphasic sleep. In short, polyphasic sleep is cutting down the night sleep and adding a few 20- or 30-minute sleeping breaks during the day.
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