Sleep is surprisingly little understood. Scientists still haven\u2019t agreed on how it evolved, or what its purpose is. What we do know, however, is that it is vital \u2013 and that many of us aren\u2019t getting enough.<\/p>\n
This is partly a symptom of what I call \u201cthe great acceleration\u201d \u2013 the speeding up of everyday life, driven largely by technology. As we work and play harder, sleep gets squeezed out. Studies show that we\u2019re getting\u00a0less and worse sleep: in one survey only 15% of Britons said they felt refreshed by it.<\/p>\n
We\u2019ve all read the warnings about reading iPhones in bed. But while that\u2019s part of the problem (because of the wavelengths of light they emit), there\u2019s something much bigger going on. What we think of as the body clock isn\u2019t one clock at all. It\u2019s billions of them embedded into our every cell. This is why we get jet lag: those billions of clocks, and the processes they govern (such as digestion or light-dark perception), get out of kilter with each other.<\/p>\n
The great acceleration has nudged our bodies out of synch with the day\/night cycle \u2013 and the result is what experts call social jet lag. We live at \u201cwork o\u2019clock\u201d, wrenching ourselves back to normal at weekends. According to Till Roenneberg, one of the world\u2019s leading sleep researchers, \u201cthe majority of the population in the industrialised world\u201d suffers from this \u201cforced synchrony\u201d and pays the\u00a0price in terms of health and wellbeing \u2013 not least since those clocks also control vital processes such as detoxification or DNA repair.<\/p>\n
The more antisocial your schedule, the greater the problems. Shift work is now classified as a probable carcinogen by the World Health Organisation, following monitoring of\u00a0night workers such as nurses as well as studies in which mice were forced to flip their day\/night cycle. As well as increased cancer risk, the animals developed all kinds of other problems and had shorter life spans.<\/p>\n
Long night shifts have been held responsible for all manner of accidents, including Chernobyl (where the workers had been on duty\u00a0for at least 13 hours).\u00a0One of the key symptoms of sleep deprivation \u2013 just like being drunk \u2013 is that you don\u2019t realise how badly off you are. When scientists monitored junior doctors at night, they found \u201cmicro-sleep\u201d events happening all over their\u00a0brains: they would be partly or largely asleep in the middle of conversations, and even operations.<\/p>\n
Even those with kinder schedules suffer and social jet lag can cause us to fall into a \u201cstimulant-sedative loop\u201d: caffeine to wake us up in the morning, booze to calm us down in the evening. But alcohol or sleeping tablets don\u2019t give us proper, natural sleep, meaning that we need even more stimulants to get going again.<\/p>\n
So how can we fix this? We do need to look after night workers better \u2013 and put down the iPhone before bed. But we can also find and follow our \u201cchronotype\u201d. Being a lark or an owl is not just a matter of psychological preference, it\u2019s genetically determined. Some of us tend to feel more awake and alert late on; others spring up at the crack of dawn. (The standard diagnostic \u201cmorningness-eveningness\u201d questionnaire is widely available online; AutoMEQ has been used since 1976.)<\/p>\n
People should probably be working hours that suit their chronotype; jobs with shifting schedules should go to those in the middle of the spectrum, who find it easier to adjust. If we built\u00a0our schedules around when we\u00a0were biologically programmed to feel\u00a0best, we\u2019d be more productive \u2013 and happier and healthier, too.<\/p>\n
–<\/p>\n
Guardian UK<\/p>\n","protected":false},"excerpt":{"rendered":"
Sleep is surprisingly little understood. Scientists still haven\u2019t agreed on how it evolved, or what its purpose is. What we do know, however, is that it is vital \u2013 and that many of us aren\u2019t getting enough. This is partly a symptom of what I call \u201cthe great acceleration\u201d \u2013 the speeding up of everyday […]<\/p>\n","protected":false},"author":14,"featured_media":120686,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1565],"tags":[],"yoast_head":"\n