based on p.40, ex.23 There are very few cases of people walking in their sleep. But while sleepwalking is a form of behaviour, it can be easily explained – there is nothing about it. To understand it, us start with sleep itself. We need to sleep so that our tired organs will rest and be restored. We still do not have a(n) scientific explanation of how and why we sleep, but it is that there is a "sleep centre" in the brain which regulates the sleeping and waking of the body. The blood, in its turn, regulates this sleep centre. The activity of our body all day certain substances into the blood and it can function in the way it does. While working, the sleep centre does two things. The first is to block off of the brain so that we no longer have the will to do anything. We might call this "brain sleep". The second thing it does is to block off certain nerves in the brain stem so that internal organs and our limbs fall asleep. Let us call this "body sleep". And normally these two reactions, or kinds of sleep, are . But under certain conditions they may be separated! The brain may sleep while the body is . This might happen to a person whose nervous system doesn't react normally. So such people might get out of bed while their brain is asleep and walk about.

Задание

basedonp.40, ex.23

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Thereareveryfewcasesofpeoplewalkingintheirsleep. Butwhilesleepwalkingisa[specifying|peculiar|common|efficient]formofbehaviour, itcanbeeasilyexplained–thereisnothing[acceptable|unbelievable|mysterious|incredible]aboutit.Tounderstandit, [let|allow|make|permit]usstartwithsleepitself.Weneedtosleepsothatourtiredorganswillrestandberestored.Westilldonothavea(n)[affective|exact|effective|neat]scientificexplanationofhowandwhywesleep, butitis[concerned|regarded|believed|reflected]thatthereisa "sleepcentre" inthebrainwhichregulatesthesleepingandwakingofthebody.Theblood, initsturn, regulatesthissleepcentre.Theactivityofourbodyallday[responds|remains|releases|regains]certainsubstancesintothebloodanditcanfunctioninthewayitdoes.Whileworking, thesleepcentredoestwothings.Thefirstistoblockoff[tip|piece|part|length]ofthebrainsothatwenolongerhavethewilltodoanything.Wemightcallthis "brainsleep".Thesecondthingitdoesistoblockoffcertainnervesinthebrainstemsothatinternalorgansandourlimbsfallasleep.Letuscallthis "bodysleep".Andnormallythesetworeactions, orkindsofsleep, are[inserted|concluded|connected|associated].Butundercertainconditionstheymaybeseparated!Thebrainmaysleepwhilethebodyis[woke|awoke|awake|wakes].Thismighthappentoapersonwhosenervoussystemdoesn'treactnormally.Sosuchpeoplemightgetoutofbedwhiletheirbrainisasleepandwalkabout.

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