I if a sound that is dance brief just be familiar to most diverse in the course it's the sound of the alarm clock and what worked really closely awful sound does is still the single most important behavior experience that we have and that sleep if your average to the person 36 percent of your life will be spent to sleep which means that if you live to ninety then 32 years thirty-two years will have been spent entirely asleep know what for 52 years is telling us that sleep at some level is important and yet for most of us we don't you sleep a second thought we throw it away we really just don't think about sleep and so what I'd like to do today is change your views change your ideas in your thoughts about sleep and and the journey that would take you on we need to start by going back in time enjoy the honey heavy you slumber any ideas who said that shakespeare's you this season yes the few more quotes asleep a gentle sleep nature softness have life righty shakespeare again from I would say it the Scottish play from the same time sleep is the golden chain that twice health in our bodies together extreme prophetic by Thomas Dekker another Elizabethan dramatists but if we jump forward four hundred years the typhoon about sleep changes somewhat this is from thomas edison from the beginning of the 20th century sleep is a criminal waste of time inherited from our cave days Frank and if we also jump into the 1980s some of you may remember margaret thatcher was reported to said sleep is for wimps um on the course the infamous was his name infamous Gordon Gekko from wall street said money never sleeps what do we do in the 20th century about sleep well of course we use thomas Edison's like Pope to invade the night we occupied the dark and any and in the process of this occupation we've treated sleep as an illness almost we've we've treated as a enemy an enemy I'm utmost now i spose we think of we tolerate the need to sleep and at worst perhaps many of us think I've sleepers and the list that these some sort of a cure ago igman ignorance about sleep is really quite profound why is it why do we have an intensely in our thoughts well it's because you do do anything much while you're asleep it sees you don't beat you don't drink and you don't have sex well most us anyway ok and so therefore it's sorry it okay it's a complete waste of time right wrong actually sleep is incredibly important part about biology and your scientists are beginning to explain why it's so very important so let's move to the brain now here we have a bright this is donated by a social scientist I'm who and they said they didn't know what it was in the how to use it so up a so I so I ok for it if I don't think they noticed okay up the point I'm trying to make is that when you're asleep this thing doesn't shut down in fact some areas the brain actually more active during the sleep state the during the weeks stated the other thing that's really important about sleep is that it doesn't arise from a single structure within the brain what is to some extent a network property if we think the brain on its back