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Two hours a night: Japan PM’s sleep schedule prompts concerns about work-life balance
(www.theguardian.com)
this post was submitted on 14 Nov 2025
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No lie I really suffer from this same sleep condition. I sleep 4 hrs per day only. My body can never sleep longer than 2-3 hrs max without waking up; After 6 hrs then I may feel headache and sleep another 1-2 hrs again. and this's been aging my health badly.
I've been going like this for almost 20 yrs now; before that I used to abuse combinations of amphetamine/zolpidem-based drugs which helped me stay up/sleep.
Biphasic/Polyphasic sleep by itself isn't anything bad, and it is a technique some use for getting the same amount in less total time. Humans didn't really start consistently sleeping 8 solid hours in one go until the industrial revolution or so.
For me personally, while normally I'll do 8-10 hours, if I'm extremely tired from like an all-nighter or something, I will get exactly 4½ hours of sleep at first, always, without a doubt. I'll then wake up unable to sleep until after roughly 6-8 hours of being awake at which point I'll crash and have to go back to sleep.
Thank you so much I just learned about this. Exactly I sleep twice a day ~2.5 hrs each, but can never sleep more than 3 hrs at once.
However, in the same article they point that Irrelgular Sleep Wake rhythem is a disorder. I have the worst memory for someone in his 40s. you have no idea how I'm so afraid of dementia at later age of my life.
Just wanted to thank you again for letting me know about this. I will have to do more research before I decide to medicate myself.
That's based on some really tendentious readings of a few people's accounts of waking up at night in the Middle Ages. Some people probably did that, especially at latitudes where the nights are 18 hours long in winter, but generalizing that to something that happened everywhere and at all times of year prior to the industrial revolution is a massive stretch.
Not just the second sleep theory, though I'd argue it isn't exactly just a "few peoples accounts", but stuff like siesta and naps in general.
The point isn't to say everyone slept the exact same biphasic sleep before but that after the industrial revolution the shift has been for everyone to transition to the "8-hours at night in one go at exactly the same time" method, which doesn't suit everyone and isn't exactly natural. Before artificial lights and clocks people slept with way more irregularity as there wasn't any strict time schedule to follow, and people waking up during the night or not getting enough sleep at one go wasn't really such an issue.
Not to mention that your sleep would have to follow the seasons and the sun way more.