{"id":307,"date":"2013-05-21T22:32:06","date_gmt":"2013-05-21T22:32:06","guid":{"rendered":"http:\/\/scqa.hult.edu\/en\/news\/hult-labs\/2013\/may\/is-one-sleep-per-night-enough-you-may-need-two\/"},"modified":"2026-03-23T11:07:44","modified_gmt":"2026-03-23T11:07:44","slug":"is-one-sleep-per-night-enough-you-may-need-two","status":"publish","type":"post","link":"https:\/\/www.hult.edu\/blog\/is-one-sleep-per-night-enough-you-may-need-two\/","title":{"rendered":"Is One Sleep Per Night Enough? You May Need Two"},"content":{"rendered":"<p>Imagine a world in which everyone is a night owl. Everyone, including you, goes to sleep soon after the sun sets. But then everyone rises a few hours later \u2013 and not because they can\u2019t <a href=\"https:\/\/www.hult.edu\/blog\/how-sleep-deprivation-affects-work-and-performance\/\">sleep<\/a>, but because it\u2019s the end of the night&#8217;s <em>first<\/em> sleep. While you&#8217;re up, you do your best thinking. You use the wee hours of the pitch-black night to make plans, record your most profound thoughts, and reflect. Afterwards, you retire for your <em>second<\/em> sleep. As dawn breaks, you wake up with the sun. During the day, you operate at maximum capacity; you never experience an afternoon energy slump, nor drowsily crave a catnap after lunch. Sound farfetched?<\/p>\n<p>This is not a scene from a science fiction tale, nor is it a new nocturnal trend among Millennials. Whether this sounds outlandish to you or not, know this: the way we sleep now, consisting (hopefully) of one long stretch, is a modern invention \u2013 and it may not be in our best interest.<\/p>\n<p>There\u2019s compelling evidence that prior to the invention of the light bulb, when only fire fueled nightly illumination, human beings went to sleep soon after the sun set and slumbered in two parts: they fell into a \u201cfirst sleep,\u201d woke up for a couple hours, and then fell back into a \u201csecond sleep.\u201d So claims historian A. Roger Erkich, whose 16-years of fascinating research led to the discovery that pre-industrial societies \u2013 on different continents \u2013 engaged in \u201csegmented sleep\u201d (he <a href=\"http:\/\/www.amazon.com\/At-Days-Close-Night-Times\/dp\/0393329011\/ref=sr_1_1?ie=UTF8&amp;qid=1368813802&amp;sr=8-1&amp;keywords=erkich\">wrote a book<\/a> about it, too).<\/p>\n<p>David K. Randall\u2019s article \u201c<a href=\"http:\/\/www.nytimes.com\/2012\/09\/23\/opinion\/sunday\/rethinking-sleep.html?pagewanted=all&amp;_r=0\">Rethinking Sleep<\/a>\u201d describes how Erkich started off researching \u201cthe history of the night and began to notice strange references to sleep.\u201d Digging further, he saw that plenty of literary and historical references alluded to the standardized practice of segmented sleep. A few examples include: \u201ca character in the <em>Canterbury Tales<\/em> [who]\u2026decides to go back to bed after her \u2018first sleep,\u2019\u201d and \u201ca doctor in England [who] wrote that the time between the \u2018first sleep\u2019 and the \u2018second sleep\u2019 was the best time for study and reflection.\u201d<\/p>\n<p>In the \u201c<a href=\"http:\/\/www.bbc.co.uk\/news\/magazine-16964783\">The Myth of the Eight-Hour Sleep<\/a>,\u201d Stephanie Hegarty provides even more description of the interval between each sleep period: \u201cDuring this waking period people were quite active. They often got up, went to the toilet or smoked tobacco and some even visited neighbors. Most people stayed in bed, read, wrote and often prayed. Countless prayer manuals from the late 15th Century offered special prayers for the hours in between sleeps.\u201d But not everyone prayed. Hegarty quotes a couple of lines from an early English ballad, <em>Old Robin of Portingale<\/em>: &#8220;And at the wakening of your first sleepe You shall have a hott drinke made, And at the wakening of your next sleepe Your sorrowes will have a slake.&#8221; Maybe that\u2019s a good suggestion for the next bout of insomnia. In any case, all this begs the question: why is segmented sleep not a part of our lives today?<\/p>\n<p>As Hegarty describes it, with the advent of street lamps in 17<sup>th<\/sup> century, coffee houses that remained open at night, and a growing acceptance of the night as a \u201clegitimate place of activity,\u201d it became more fashionable to spend the evening out rather than at home in bed. About this time, long-held, menacing beliefs about the night also started to lose steam. In his book <em> <a href=\"http:\/\/www.amazon.com\/Evenings-Empire-History-Studies-European\/dp\/0521721067\">Evening Empire<\/a> <\/em>, Craig Koslofsky wrote: \u201cAssociations with night before the 17th Century were not good\u2026The night was a place populated by people of disrepute \u2013 criminals, prostitutes and drunks.\u201d As popular perceptions of the night changed, there was growing acceptance of casting aside segmented sleep in favor of the singular variety. The dawning of the Industrial Revolution only sped along that process. \u201cBy the 1920s the idea of a first and second sleep had receded entirely from our social consciousness,\u201d wrote Hegarty.<\/p>\n<p>Now, given the 21<sup>st<\/sup> century ubiquity of electricity and electronic gadgets \u2013 including \u201ccities that never sleep\u201d \u2013 would \u201cmodern\u201d humans even be capable of re-adjusting to two sleep periods per night? It appears so. Randall\u2019s <a href=\"http:\/\/www.nytimes.com\/2012\/09\/23\/opinion\/sunday\/rethinking-sleep.html?pagewanted=all&amp;_r=0\">article<\/a> also references a study that psychiatrist Thomas A. Wehr conducted in the early 1990s, in which study participants went without any means of artificial light for <a href=\"http:\/\/www.bbc.co.uk\/news\/magazine-16964783\">fourteen hours a day, for 30 days<\/a>. At the beginning of the study, participants slept through the night. But by the end of the study all the participants had developed the same nightly pattern: they fell asleep for four hours, woke up for approximately two, and fell back asleep for a final four. What does this say about the widely accepted belief that we need eight hours of sleep per night?<\/p>\n<p>In an <a href=\"http:\/\/www.time.com\/time\/health\/article\/0,8599,1812420,00.html\">interview<\/a> with Laura Blue, sleep expert Daniel Kripke eschewed the idea that eight hours of uninterrupted sleep is the dictum we should go by because there is simply no science to back that up. In fact, \u201cstudies show that people who sleep between 6.5 hours and 7.5 hours a night\u2026live the longest\u2026people who sleep 8 hours or more, or less than 6.5 hours\u2026don&#8217;t live quite as long. There is just as much risk associated with sleeping too long as with sleeping too short.\u201d And in her <a href=\"http:\/\/www.bbc.co.uk\/news\/magazine-16964783\">article<\/a>, Hegarty quotes sleep expert Gregg Jacobs as saying: \u201cFor most of evolution we slept a certain way\u2026waking up during the night is part of normal human physiology.\u201d So maybe we can give ourselves a break next time we are wide awake in the wee hours of the night, considering that it was something our ancestors did for thousands of years!<\/p>\n<p>\u201cOne of the reasons I like to publicize these facts is that I think we can prevent a lot of insomnia and distress just by telling people that short sleep is OK. We&#8217;ve all been told you ought to sleep 8 hours, but there was never any evidence,\u201d said Kripke in Blue\u2019s interview. There are a couple of takeaways here: we should aim for the amount of sleep that allows us to feel good during the day, and if that\u2019s not in an eight hour block, then that\u2019s OK, too. For some of us, this means that a daily nap may be just as important as that first cup of coffee in the morning. And for all of us, this means that what works for us individually won\u2019t apply to everyone. Because while we may all have different sleep needs, we generally want the same thing: to feel rested enough so that we can be productive, successful people during the day \u2013 even if this means we need that \u201chott drinke\u201d to slake our thirst at night.<\/p>\n<p><em>Photo courtesy of <a href=\"http:\/\/www.flickr.com\/photos\/renaud-camus\/8592212860\/\" target=\"_blank\" rel=\"noopener\">Renaud Camus<\/a>.<\/em><\/p>\n<p>Grow your leadership capabilities with an <a href=\"https:\/\/www.hult.edu\/mba\/\">MBA in international business<\/a> at Hult. To learn more, take a look at our blog <a href=\"https:\/\/www.hult.edu\/blog\/a-new-model-for-leadership-development-in-the-21st-century\/\">A new model for leadership development in the 21st century<\/a>, or give your career a boost with our <a href=\"https:\/\/www.hult.edu\/masters\/international-business\/\">Masters in International Business<\/a>. Download a brochure or get in touch today to find out how Hult can help you to learn about the business world, the future, and yourself.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imagine a world in which everyone is a night owl. Everyone, including you, goes to sleep soon after the sun sets. But then everyone rises a few hours later \u2013&#8230;<\/p>\n","protected":false},"author":4,"featured_media":2109,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[24],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Is One Sleep Per Night Enough? You May Need Two | Hult International Business School<\/title>\n<meta name=\"description\" content=\"Imagine a world in which everyone is a night owl. Everyone, including you, goes to sleep soon after the sun sets. 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