Elaine Morgan says we evolved from aquatic apes. Jessa Gamble: Our natural sleep cycle. Segmented Sleep: It's actually normal - Healthy Living on Shine. So there you lay, awake, after only three or four hours of sleep. You worry, you toss and turn, finally you go back to sleep, but you know something is wrong with you. Is it? Although some people are never really bothered by irregular sleep patterns, others worry that, if they wake up during the night, they will not get enough sleep and will not be able to function well the next day. Some blame the barking dog, others blame a partner's snoring as the reason for their wakefulness. How people used to sleep Sleep patterns of yore are not really a part of recorded scientific information. Ekrich suggests that, in pre-industrial times, people went to bed when it was dark outside. This was followed by the "second sleep," which lasted another three to five hours.
Thomas Jefferson planned his time well, and would read philosophy before going to bed "whereon to ruminate in the intervals of sleep. " Sleep after the Industrial Revolution Have our sleep patterns really changed? Segmented sleep. Segmented sleep, also known as divided sleep, bimodal sleep pattern, bifurcated sleep, or interrupted sleep, is a polyphasic or biphasic sleep pattern where two or more periods of sleep are punctuated by periods of wakefulness. Along with a nap (siesta) in the day, it has been argued that this is the natural pattern of human sleep.[1][2] A case has been made that maintaining such a sleep pattern may be important in regulating stress.[2] Historian A.
Roger Ekirch[3][4] has argued that before the Industrial Revolution, segmented sleep was the dominant form of human slumber in Western civilization. He draws evidence from documents from the ancient, medieval, and modern world.[2] Other historians, such as Craig Koslofsky,[5] have endorsed Ekirch's analysis. Segmented sleep as a historical norm[edit] The human circadian rhythm regulates the human sleep-wake cycle of wakefulness during the day and sleep at night. Wehr's study[edit] Physiology[edit] See also[edit] References[edit] TED Talks - PostRank - Google Docs.
Rebecca Saxe: How we read each other's minds. David Deutsch: A new way to explain explanation.