VIII. Read the text and give a 2-minute summary of it. Record your summary

VII. Speak about two kinds of sleep.

V. Complete the sentences.

IV. Find English equivalents in the text

III. Give Russian equivalents of the following.

II. Answer the question expressing your own opinion. (no less that 10 sentences).

Do people dream during NREM sleep or REM sleep?

Electrical activity of the brain; cerebral blood flow; brainwaves; an entirely different state of existence; act out our dreams; a remarkable feature; stay awake; accidentally; rolling eye movement; an entirely new kind of eye movement; breathe regularly; four from being a passive state; pull back the eyelids; convul­sive twitches; protect smb. from.

Проводить треть жизни; природа сна; исследовать сон; неактивное со­стояние; внешне спокойный; сердцебиение снижается; ритмично чередо­ваться; процесс обмена веществ; совершенно иное движение глаза; быстро двигаться; закрытые веки; спокойный сон; медленное, регулярное дыхание; активный сон; судорожное подергивание лица и кончиков пальцев; специа­листы предполагают; остановка дыхания; мозговое кровообращение; стре­мительно повышается.

1. Most of us spend....

2. Some people have enormous difficulty falling asleep, while others....

3. While the sleeper is outwardly calm, the electrical activity of....

4. As the sleep becomes deeper, the brainwaves....

5. While sleeping the metabolic processes....

6. Dr. Kleitman became interested in....

7. The "NREM" state is often called....

8. At the onset of REM sleep the sleeper's body is....

9. Experts speculate that REM sleep protects us from....

10. The NREM-REM cycle varies from....

VI. Make up sentences from the following words and word combinations:

1. Probably; the third of our lives; most of us; spend; asleep.

2. One; sleep; remarkably; is; active.

3. The brainwaves; becomes; larger; as the sleep; deeper; becomes.

4. The metabolic processes; while sleeping; the heart beat; slow; drops; down; and.

5. Alternate; the entire sleep period; rhythmically; throughout; two kinds of sleep.

6. Dr. Kleitman; rolling eye movements; sleep onset; became interested in; slow; the; accompany; that.

7. State; is called; "NREM"; the; "quiet sleep".

8. During; is not paralysed; NREM sleep; the body.

9. NREM sleep; the first sleep of the night; always; is.

10. During; can see; convulsive twitches of; REM sleep; we; face; fingertips; and.

Much research has been carried out in recent years into sleep. We know a great deal about the mechanics of sleep and we are beginning to know about the biochemical changes involved. However, we are still a long way from finding out answers to such questions as how much sleep a person needs. While the phys­iological basis of sleep remains very much a matter for conjecture (догадка) we do nevertheless have considerable evidence (данные) on how much sleep peo­ple obtain. Despite this (несмотря на) we need to know more about the kinds of effect that sleep deprivation (лишение) causes. In spite of considerable effort devoted to investigations why we sleep, there is still disagreement in this area. The fact that sleep deprivation causes numerous harmful (вредный) effects suggests that the body requires sleep to restore (восстанавливать) itself. How­ever, more research is needed to determine whether this is so or whether sleep is the result of adaptation to the environment. There is also the possibility that these two alternatives may not be incompatible (несовместимый).

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