"Night owl" sleep preference is a real thing and isn't a choice (being largely genetic). Night owls forced to obey a daytime schedule suffer from what researchers call "social jet lag" because it constantly feels like they're living in the wrong time zone. Here's a 3-minute AsapSCIENCE video with more details for anyone interested.
Im not going to disagree with you, but i have this nagging suspicion that most people who think they are "night owls" are really just shining a phone light in their face every night and confusing their sleep cycle.
The increase in people who can't sleep because of cell phone usage at night has increased because of cell phones. This is a well known thing. No one is saying night owls didn't exist before cellphones.
That may be true, but at least the genes for night owls are present in more people than the genes for early birds.
So it should be expected that, regardless of phone usage, over half of the population will go to bed and wake up ~2-3h later than expected.
If your timezone is closely aligned with the sun, that'd be 22:00-06:00 for early birds and 01:00-09:00 for night owls. But if your timezone isn't, both of these times would shift around.
For me personally, no matter when I go to bed, whether it's 22:00 or 03:00, I always wake up precisely 09:30 without any alarm clock. But this also means if I have to wake up earlier, e.g. at 8am, I'll be very tired and not well rested.
I think you are severely overestimating how many people sleep till 9 or later. There's no way it's more than half.
Look at what times are peak traffic or peak public transport. Anyone with kids wakes up early. Most kids do. Anyone who has to be at school by 9 is up earlier.
9am wake ups are for people in their 20s till mid 30s generally. And only if you have a very understanding white collar job. Most blue collar workers and labourers are up much earlier.
I don't think they were commenting on how many people can sleep late, I think it was a comment on what time people would naturally sleep to barring all other factors but genetics.
I am typing this in Wuhan, listening to birds singing in the middle of the night. Are they owls? No, their sleep patterns have simply adapted to the constant neon lighting all over the place.
Depression and alcohol can also negatively affect sleep patterns.
Combine depression with all night TV binge watching or phone soon browsing for a greaaaat combo.
And definitely a lot of it is just that people have gotten used to it. People think they have insomnia because every time they try to go to bed early they can't sleep but they're doing it the wrong way. They should wake up early and go to bed when they start to feel sleepy and work on sleep hygiene (including even a short walk outside). It won't be fixed in a day.
I was a night owl for a long time, literally decades. Then I went overseas, and since I came back I fall asleep by 9pm and get up between 5-6. I tend to agree with you.
We will see, but it’s been pretty consistent so far. I think it’s a bit easier for me than most people, because I can freely change my work schedule within like 6a-6p, so now I just go into work earlier and get out earlier. Sometimes I take a nap and still wake up before dinner time, and it’s awesome.