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Oh, I don't know about that. In Ekrich's ' At Day's Close: Night in Times Past' [1] seems in pre-industrial age society the norm was 'bi-modal sleep'. First or

Oh, I don't know about that. In Ekrich's ' At Day's Close: Night in Times Past' [1] seems in pre-industrial age society the norm was 'bi-modal sleep'. First or "deep" or "dead" sleep, as it was sometimes called, often seems to have taken place shortly after sunset, or at least before 10 in the evening. After two to four hours of the night's deepest rest, people would wake up for an hour or two, then resume sleep for another stretch before rising with the light. During this waking period, people would relax, ponder their dreams, or have sex. Many might find the later a good description of teenage behavior. Couple that with the physiological fact that For men, levels of testosterone are highest during sleep and require at least three hours sleep to reach this peak. [2] And just maybe teenagers are reverting to form. ----------------------------------------------------------- [1] At Day's Close: Night in Times Past - Ekirch (2006) [2] https://www.sciencealert.com/chemical-messengers-how-hormones-help-us-sleep https://www.sciencealert.com/chemical-messengers-how-hormone...

faitswulff 8y ago
It'll likely be the nth time Matthew Walker is cited here, but in his interview with Joe Rogan, he mentions this is likely a societal trend rather than a biological need: https://www.youtube.com/watch?v=pwaWilO_Pig&t=3294 https://www.youtube.com/watch?v=pwaWilO_Pig&t=3294 > Joe Rogan: Yeah, I've heard this recently, that people - that you should have two sleeps. The idea of two sleeps. > Matthew Walker: Yeah, it's actually a little different than the idea of two sleeps. So there was a time in the sort of Dickensian era where people would sleep for the first half of the night, maybe sort of 4 hours or so. Then they would wake up, they would socialize, they would eat, they would make love, then they would go back and have a second sleep. If you look at natural biological rhythms in the brain and the body, that doesn't really seem to be how we were designed. It certainly seems to be something that we did in society, but I think it's more of a societal trend than it was a biological edict. However, we do seem to have two sleep periods. Those tribes will often sleep about 6.5, 7 hours of sleep at night. And then especially in the summer they'll have that siesta like behavior in the afternoon. And all of us have that, sort of this - what's called the post-prandial dip in alertness, just means "after lunch" - and if I measure your brainwave activity with electrodes, I can see a drop in your physiological alertness somewhere between 2 to 4 pm in the afternoon [irrespective of diet].
freddie_mercury 8y ago
Note that not everyone is convinced by Ekritch. http://www.textkit.com/greek-latin-forum/viewtopic.php?f=36&t=64513 http://www.textkit.com/greek-latin-forum/viewtopic.php?f=36&... Or https://www.ncbi.nlm.nih.gov/pubmed/26480842 https://www.ncbi.nlm.nih.gov/pubmed/26480842

faitswulff 8y ago

It'll likely be the nth time Matthew Walker is cited here, but in his interview with Joe Rogan, he mentions this is likely a societal trend rather than a biological need: https://www.youtube.com/watch?v=pwaWilO_Pig&t=3294 https://www.youtube.com/watch?v=pwaWilO_Pig&t=3294 > Joe Rogan: Yeah, I've heard this recently, that people - that you should have two sleeps. The idea of two sleeps. > Matthew Walker: Yeah, it's actually a little different than the idea of two sleeps. So there was a time in the sort of Dickensian era where people would sleep for the first half of the night, maybe sort of 4 hours or so. Then they would wake up, they would socialize, they would eat, they would make love, then they would go back and have a second sleep. If you look at natural biological rhythms in the brain and the body, that doesn't really seem to be how we were designed. It certainly seems to be something that we did in society, but I think it's more of a societal trend than it was a biological edict. However, we do seem to have two sleep periods. Those tribes will often sleep about 6.5, 7 hours of sleep at night. And then especially in the summer they'll have that siesta like behavior in the afternoon. And all of us have that, sort of this - what's called the post-prandial dip in alertness, just means "after lunch" - and if I measure your brainwave activity with electrodes, I can see a drop in your physiological alertness somewhere between 2 to 4 pm in the afternoon [irrespective of diet].

freddie_mercury 8y ago

Note that not everyone is convinced by Ekritch. http://www.textkit.com/greek-latin-forum/viewtopic.php?f=36&t=64513 http://www.textkit.com/greek-latin-forum/viewtopic.php?f=36&... Or https://www.ncbi.nlm.nih.gov/pubmed/26480842 https://www.ncbi.nlm.nih.gov/pubmed/26480842